[RDBMS] Rename DBInstanceSpec to DBSpec, add DBSpec/DBEngine metadata APIs, and fetch IBM specs dynamically

[powerkimhub]

(1) Existing API Change — DBInstanceSpec renamed to DBSpec ⚠️ Breaking

• DBInstanceSpec => DBSpec, DBInstanceSpecOptions => DBSpecOptions
• Affected fields:
  • POST /rdbms request ReqInfo.DBInstanceSpec => DBSpec
  • GET /rdbms, GET /allrdbms response DBInstanceSpec => DBSpec
  • GET /rdbmsmetainfo response DBInstanceSpecOptions => DBSpecOptions
  • GET /driver/capability response DBInstanceSpecHandler => DBSpecHandler
  • GET /dborgspec* response DBInstanceSpecInfo => DBSpecInfo
  • AdminWeb: RDBSpec menu/route => DBSpec (/adminweb/rdbspec => /adminweb/dbspec)
• Core resource paths (/dbspec, /dborgspec, ...) are unchanged — only field/handler names and the AdminWeb route above.

(2) Return-value method change — IBM DBSpecOptions

• [AS-IS] RDBMSMetaInfo.DBSpecOptions returned a hardcoded static host-flavor list per engine
• [TO-BE] Queried dynamically per engine via IBM Cloud Databases CreateCapability(flavors); the static list is now only a fallback when the live call fails

(3) New APIs

• GET /dbspec, GET /dbspec/{Name}, GET /dborgspec, GET /dborgspec/{Name} — CSP DBSpec catalog (vCPU/Memory/StorageSize) per DB engine, implemented across all 9 RDBMS-capable CSPs (AWS, Azure, GCP, Alibaba, Tencent, IBM, OpenStack, NHN, NCP). Grouped under [Cloud Metadata] in swagger (like /vmspec), not RDBMS Management, since it's spec catalog metadata rather than an RDBMS lifecycle operation.
• GET /rdbmsengine — list of RDBMS engines (mysql/mariadb/postgresql) a connection's CSP actually supports, derived from GET /driver/capability's per-engine flags. Grouped under [RDBMS Management].

[powerkimhub]

Test Results

MySQL(test/rdbms-mysql-test): PASS

=================================================================================================================================================================================
                                              RDBMS CREATE & INFO TEST SUMMARY - ALL CSPs
=================================================================================================================================================================================

CSP          | Status      | Engine   | Version      | Spec                     | Storage                  | Endpoint                                 | PublicAccess | Elapsed
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
AWS          | Available   | mysql    | 8.0.46       | db.t3.medium             | 100GB|gp2                | cb-spider-mysql-test-d9vhetc2mn9dvmkc53a0.cbe86kw08whp.ap-southeast-2.rds.amazonaws.com:3306 | true         | 5m11s
AZURE        | Available   | mysql    | 8.0.21       | Standard_B1ms            | 20GB|Premium_LRS         | cb-spider-mysql-test-d9vhetk2mn9dvmkc53bg.mysql.database.azure.com:3306 | true         | 4m36s
GCP          | Available   | mysql    | 8.0          | db-custom-2-8192         | 20GB|PD_SSD              | 34.59.217.207:3306                       | true         | 3m25s
ALIBABA      | Available   | mysql    | 8.0          | mysql.n4.large.1         | 20GB|cloud_essd          | 8.141.139.88:3306                        | true         | 2m50s
TENCENT      | Available   | mysql    | 8.0          | 8000                     | 50GB|local_ssd           | bj-cdb-63xonjda.sql.tencentcdb.com:28948 | true         | 4m52s
IBM          | Available   | mysql    | 8.4          | multitenant              | 30GB|NA                  | 843563ef-f035-4c28-801b-9c258e59a1db.c2f3lg8w0g8s0rkj98i0.databases.appdomain.cloud:31639 | true         | 10m4s
OPENSTACK    | Available   | mysql    | 5.7.29       | m1.small                 | 20GB|NA                  | 183.111.177.159:3306                     | true         | 4m28s
NCP          | Available   | mysql    | MYSQL8.0.36  | SVR.VDBAS.AMD.STAND.C002.M008.NET.SSD.B050.G003 | 10GB|SSD                 | db-49m4bs.vpc-cdb.ntruss.com:3306        | N/A          | 12m26s
NHN          | Available   | mysql    | MYSQL_V8408  | m2.c2m4                  | 20GB|General SSD         | 18d7dcf5-6250-43e8-a654-e7d4faf0e7d5.external.kr1.mysql.rds.nhncloudservice.com:3306 | true         | 10m21s
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Failed : 0

MariaDB(test/rdbms-mariadb-test): OpenStack MariaDB debugging pending

=======================================================================================================
             RDBMS DATABASE MANAGEMENT TEST SUMMARY - ALL CSPs (MariaDB)
=======================================================================================================

CSP          | CreateDB   | ListDB   | FoundInList  | DeleteDB   | VerifyDeleted | Elapsed
-------------------------------------------------------------------------------------------------------
AWS          | PASS       | PASS     | FOUND        | PASS       | PASS          | 8s
ALIBABA      | PASS       | PASS     | FOUND        | PASS       | PASS          | 20s
OPENSTACK    | FAIL       | FAIL     | NOT_FOUND    | FAIL       | FAIL          | 1s
NHN          | PASS       | PASS     | FOUND        | PASS       | PASS          | 30s
-------------------------------------------------------------------------------------------------------

Total: 3 PASS, 1 FAIL