feat: Add key-related APIs in security-proxy-auth

[lindseysimple]

Resolves #5038. Add key-related APIs in security-proxy-auth to enable support for external JWT verification.

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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)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
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Codecov Report

Attention: Patch coverage is 50.68966% with 143 lines in your changes missing coverage. Please review.

Project coverage is 28.11%. Comparing base (b24805f) to head (c38af36).

Files with missing lines	Patch %	Lines
...xyauth/infrastructure/interfaces/mocks/DBClient.go	34.92%	20 Missing and 21 partials ⚠️
internal/pkg/infrastructure/postgres/keystore.go	0.00%	31 Missing ⚠️
...ternal/pkg/utils/crypto/interfaces/mocks/Crypto.go	40.47%	13 Missing and 12 partials ⚠️
internal/pkg/utils/crypto/aes.go	67.44%	7 Missing and 7 partials ⚠️
internal/security/proxyauth/application/key.go	81.39%	4 Missing and 4 partials ⚠️
internal/security/proxyauth/router.go	0.00%	7 Missing ⚠️
internal/security/proxyauth/config/config.go	0.00%	4 Missing ⚠️
internal/security/proxyauth/main.go	0.00%	4 Missing ⚠️
internal/security/proxyauth/controller/key.go	94.11%	1 Missing and 1 partial ⚠️
internal/core/command/router.go	0.00%	1 Missing ⚠️
... and 6 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5039      +/-   ##
==========================================
+ Coverage   27.71%   28.11%   +0.39%     
==========================================
  Files         245      256      +11     
  Lines       18197    18462     +265     
==========================================
+ Hits         5044     5191     +147     
- Misses      11998    12071      +73     
- Partials     1155     1200      +45     

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[cloudxxx8]

LGTM

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.1% Duplication on New Code

See analysis details on SonarQube Cloud