feat: Add the Keeper registry db methods for Postgres

[lindseysimple]

Resolves #4877. Add the Keeper registry db methods for Postgres.

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• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 4.04040% with 95 lines in your changes missing coverage. Please review.

Project coverage is 36.92%. Comparing base (2694c23) to head (a8bb910).

Files with missing lines	Patch %	Lines
internal/pkg/infrastructure/postgres/registry.go	0.00%	83 Missing ⚠️
internal/pkg/infrastructure/postgres/sql.go	0.00%	12 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4914      +/-   ##
==========================================
- Coverage   37.17%   36.92%   -0.26%     
==========================================
  Files         125      125              
  Lines       12184    12276      +92     
==========================================
+ Hits         4530     4533       +3     
- Misses       7260     7349      +89     
  Partials      394      394              

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[cloudxxx8]

LGTM