Add Collection#bulkCreateOrReplace

[suddendust]

Description

This PR adds support for Collection#bulkCreateOrReplace. This is akin to Collection#bulkUpsert but with createOrReplace semantics. For now, it's only implemented for FlatPostgresCollection.

Testing

Added integration tests.

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

❌ Patch coverage is 76.56250% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.21%. Comparing base (f3bc54c) to head (1579b0e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...documentstore/postgres/FlatPostgresCollection.java	77.77%	12 Missing and 2 partials ⚠️
.../org/hypertrace/core/documentstore/Collection.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #284      +/-   ##
============================================
- Coverage     81.25%   81.21%   -0.05%     
  Complexity     1486     1486              
============================================
  Files           240      240              
  Lines          7176     7240      +64     
  Branches        676      685       +9     
============================================
+ Hits           5831     5880      +49     
- Misses          916      929      +13     
- Partials        429      431       +2     

Flag	Coverage Δ
integration	81.21% <76.56%> (-0.05%)	⬇️
unit	54.73% <0.00%> (-0.49%)	⬇️

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