feat: implement ScyllaDB driver

[brianheineman]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.64751% with 109 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.01%. Comparing base (f53f16d) to head (24365ad).

Files with missing lines	Patch %	Lines
drivers/scylladb/src/connection.rs	76.47%	64 Missing ⚠️
drivers/scylladb/src/convert.rs	97.10%	21 Missing ⚠️
drivers/scylladb/src/config.rs	88.16%	20 Missing ⚠️
drivers/scylladb/src/metadata.rs	97.03%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #404      +/-   ##
==========================================
+ Coverage   88.73%   89.01%   +0.28%     
==========================================
  Files         154      158       +4     
  Lines       17183    18488    +1305     
==========================================
+ Hits        15247    16457    +1210     
- Misses       1936     2031      +95     

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