DOC-2210: Document SAP HANA connector (sap_hana input + hana driver)

[JakeSCahill]

What

Draft docs for the SAP HANA connector, per DOC-2210 (eng: ENG-1213). Two deliverables:

• sap_hana input — new page documenting all reading modes, per-mode examples, schema_registry_encode auto-registration, metadata, permissions, and configuration fields.
• hana driver for sql_insert/sql_raw — a self-managed-only SAP HANA section on sql_raw covering driver: hana and the distinctive UPSERT ... WITH PRIMARY KEY syntax.

⚠️ Draft — blocked on connect#4462

The connector is not yet merged (redpanda-data/connect#4462, not on main). This PR is intentionally a draft:

• component_type_dropdown::[] is commented out until sap_hana lands in the upstream info.csv (same pattern as the iceberg page).
• The configuration-fields table is hand-authored from the PR source; on merge, the auto-docs pipeline generates the standard field/example partials, which should replace it (TODO marker in the page).
• No "Introduced in version" line — the source Version() tag is stale (4.92.0, already shipped without this feature); the real version is unknown until merge.

Changes

• modules/components/pages/inputs/sap_hana.adoc (new)
• modules/ROOT/nav.adoc — input nav entry
• modules/components/pages/outputs/sql_raw.adoc — ifndef::env-cloud[] SAP HANA section (self-managed only)

Verification

• Config field tree, 5 modes, metadata, Enterprise gating, hana driver + DSN, and cloud=n all verified against connect#4462 source (internal/impl/saphana/, internal/impl/sql/conn_fields.go, internal/plugins/info.csv).
• Local Antora build clean (no xref/CSV errors). Cloud gating confirmed: the SAP HANA sql_raw section renders in the connect build and is suppressed in cloud.

Findings for engineering / reviewers (from research)

1. Modes: implementation has 5 modes (bulk, incrementing, query, timestamp, timestamp+incrementing), not the 3 in the ticket — docs describe all 5. Worth confirming the ticket/epic should be updated.
2. Version: source Version("4.92.0") is stale — needs correcting at merge (see also the pattern of CON-513 for the jira input).
3. Cloud: info.csv marks sap_hana cloud=n ("not yet certified for cloud"). No cloud-docs follow-up until that changes.
4. Driver enum is shared — adding hana also enables it in sql_select and the sql processors, not just the two named outputs. Likely intended.
5. TLS: no explicit tls field found; presumably DSN-param based — confirm.

Once the connector merges and docs regenerate, mark ready for review and swap the hand-authored fields table for the generated partial.

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