POC: Improve JDBC driver performance using ByteBufferManager for TDS packet handling

[Ananya2]

This POC introduces a ByteBufferManager and BufferPool in the JDBC driver to optimize memory usage during TDS packet processing.

Test Results – CRD App
Dataset: 100 Million Records · 601 Columns
Metric Comparison: Average Heap Usage & Execution Time

JDBC Driver | Avg. Heap Usage | Execution Time (ms)
mssql-jdbc (Before Optimization) | 311.34 MB | 5,017,218
mssql-jdbc (After Optimization) | 309.11 MB | 4,944,792
jTDS | 374.64 MB | 3,499,575

[codecov]

Codecov Report

Attention: Patch coverage is 86.84211% with 5 lines in your changes missing coverage. Please review.

Project coverage is 51.87%. Comparing base (52303d8) to head (30dd55e).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...om/microsoft/sqlserver/jdbc/ByteBufferManager.java	78.94%	1 Missing and 3 partials ⚠️
.../java/com/microsoft/sqlserver/jdbc/BufferPool.java	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2671      +/-   ##
============================================
+ Coverage     51.62%   51.87%   +0.24%     
- Complexity     4006     4045      +39     
============================================
  Files           147      149       +2     
  Lines         33804    33836      +32     
  Branches       5652     5654       +2     
============================================
+ Hits          17453    17553     +100     
+ Misses        13888    13811      -77     
- Partials       2463     2472       +9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[mmimica]

You need to clear the buffer first, then put it pool. You lose ownership once added to pool and another thread might take the buffer, you can't touch it any more.