feat: add structured JSON output to test command

[ayushshukla1807]

The current test command only provides human-readable output. To support integrations with tools like the upcoming VS Code extension, structured data is required.

This PR adds an --output (or -o) flag to the test command. When set to json, the command suppresses progress logging and prints the final TestResultSummary as a JSON object.

Example:
microcks-cli test <api:version> <endpoint> <runner> -o json

[lbroudoux]

Hey @ayushshukla1807!
Thanks for taking the time to submit this PR. Can you check the failing DCO check? This is a prerequisite for CNCF projects. Thanks!

[ayushshukla1807]

I've amended the commit to include the DCO sign-off (-s) as requested. Ready for review!

[github-actions]

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[Harsh4902]

Clossing this as it's tackled in #488. Thanks @ayushshukla1807, and sorry we couldn't merge your contribution.