Spanner bulk data migration: Support for Date as a primary key

[nmemond]

This is a copy of #3082 but up-to-date with main (and a minor fix for converting date to/from a numerical value), because that developer is out of office for the rest of the year and I don't have permissions to push to their fork.

[gemini-code-assist]

Summary of Changes

Hello @nmemond, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Spanner bulk data migration tool by adding robust support for DATE columns serving as primary keys in MySQL source databases. The changes ensure that DATE types are properly identified, their ranges can be efficiently split for optimized data transfer, and the overall migration process handles them without issues. This update improves the tool's compatibility and reliability for a wider array of database schemas.

Highlights

• Date Primary Key Support: Introduced comprehensive support for DATE data types when used as primary keys in MySQL for Spanner bulk data migration. This includes recognizing DATE as a valid index type and enabling its use in range splitting.
• Boundary Splitting for Dates: Implemented new logic within BoundarySplitterFactory to correctly split java.sql.Date ranges, facilitating parallel processing for tables with DATE primary keys.
• Schema and Test Updates: Updated the SourceColumnIndexInfo to include DATE as an IndexType and extended various test suites (dialect adapter tests, boundary splitter tests, and integration tests) to validate the new DATE primary key functionality end-to-end.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.86%. Comparing base (bf172e2) to head (5962949).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3113      +/-   ##
============================================
+ Coverage     50.49%   55.86%   +5.37%     
+ Complexity     5038     1640    -3398     
============================================
  Files           973      471     -502     
  Lines         59718    26496   -33222     
  Branches       6510     2776    -3734     
============================================
- Hits          30154    14802   -15352     
+ Misses        27435    10797   -16638     
+ Partials       2129      897    -1232     

Components	Coverage Δ
spanner-templates	71.85% <100.00%> (+1.08%)	⬆️
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	80.08% <ø> (-0.02%)	⬇️
spanner-live-reverse-replication	77.73% <ø> (-0.02%)	⬇️
spanner-bulk-migration	88.25% <100.00%> (+0.02%)	⬆️

Files with missing lines	Coverage Δ
...jdbc/dialectadapter/mysql/MysqlDialectAdapter.java	99.62% <100.00%> (+<0.01%)	⬆️
...source/reader/io/jdbc/iowrapper/JdbcIoWrapper.java	92.89% <ø> (ø)
...niformsplitter/range/BoundaryExtractorFactory.java	100.00% <100.00%> (ø)
...uniformsplitter/range/BoundarySplitterFactory.java	100.00% <100.00%> (ø)
...source/reader/io/schema/SourceColumnIndexInfo.java	68.00% <100.00%> (+1.33%)	⬆️

... and 521 files with indirect coverage changes

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