Swagger configuration

[dukris]

Closes #21

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PR-Codex overview

Focus of the PR:

This PR focuses on adding authentication and authorization using OAuth2 and configuring OpenAPI for Swagger documentation.

Detailed summary:

• Added WebConfig.java to configure OAuth2 authentication and authorization.
• Added openApi() method in WebConfig.java to configure OpenAPI for Swagger documentation.
• Modified application.yaml to include APP_TITLE and APP_VERSION properties.
• Added springdoc-openapi-starter-webmvc-ui dependency in pom.xml for Swagger UI.
• Updated the banner.txt file with the application title, version, and Spring Boot version.

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[codecov]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (ebc419c) 28.34% compared to head (08f2a62) 24.32%.

Files	Patch %	Lines
...main/java/git/tracehub/pmo/security/WebConfig.java	0.00%	23 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #22      +/-   ##
============================================
- Coverage     28.34%   24.32%   -4.03%     
  Complexity       23       23              
============================================
  Files            15       15              
  Lines           127      148      +21     
  Branches          4        4              
============================================
  Hits             36       36              
- Misses           90      111      +21     
  Partials          1        1              

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