Feature: CLI module

[testower]

CLI Module Implementation

Closes #97

Implements a command-line interface for GBFS validation as a new Maven module (gbfs-validator-java-cli).

Changes

• New CLI module with Picocli for argument parsing
• Executable JAR packaging via Maven Shade Plugin
• Authentication support for Basic, Bearer, and OAuth Client Credentials
• Multiple output formats: human-readable text and JSON
• Report options: console output and file saving
• Exit codes: 0 (valid), 1 (validation errors), 2 (system errors)
• Test coverage: unit tests with WireMock for integration testing
• Version injection from Maven build properties

Usage

java -jar gbfs-validator-cli.jar --url https://example.com/gbfs.json
java -jar gbfs-validator-cli.jar --url https://example.com/gbfs.json --verbose --save-report report.txt
java -jar gbfs-validator-cli.jar --url https://example.com/gbfs.json --format json
java -jar gbfs-validator-cli.jar --url https://example.com/gbfs.json --auth-type basic --username user --password pass

Implementation

- Thin orchestration layer leveraging existing gbfs-validator-java and gbfs-validator-java-loader modules
- Console and JSON report formatters for ValidationResult output
- Picocli annotations for declarative CLI definition
- Jacoco and Surefire configuration matching other modules

[sonarqubecloud]

Quality Gate failed

Failed conditions
60.1% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[codecov-commenter]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered ☂️