feat: add Value::Map

[brianheineman]

No description provided.

[github-actions]

Bencher Report

Branch	add-value-map
Testbed	localhost

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Benchmark	Latency	nanoseconds (ns)
postgres-embedded	📈 view plot ⚠️ NO THRESHOLD	825,610,000.00
postgresql-embedded	📈 view plot ⚠️ NO THRESHOLD	836,680,000.00
rusqlite	📈 view plot ⚠️ NO THRESHOLD	4,575,400.00
sqlite	📈 view plot ⚠️ NO THRESHOLD	4,888,800.00

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[codecov]

Codecov Report

Attention: Patch coverage is 75.89286% with 27 lines in your changes missing coverage. Please review.

Project coverage is 93.56%. Comparing base (d6b27c3) to head (597adb0).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
rsql_drivers/src/value.rs	75.89%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
- Coverage   93.71%   93.56%   -0.16%     
==========================================
  Files         107      107              
  Lines       13163    13275     +112     
==========================================
+ Hits        12336    12421      +85     
- Misses        827      854      +27     

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