Signify breaking change in output

[Idane]

Is your feature request related to a problem? Please describe.

When using an exclamation mark to trigger a breaking change, it passes validation. However, the outputs lack an indication that the title represent a breaking change, and even remove the exclamation mark from feat:

feat!: do major release

Outputs:

{
  "type": "feat",
  "scope": "",
  "subject": "do major release"
}

Describe the solution you'd like

Add a breakingChange boolean output

Describe alternatives you've considered

[amannn]

This action uses conventional-commits-parser to parse the PR title and subsequently populates the output:

action-semantic-pull-request/src/validatePrTitle.js

Lines 31 to 34 in 80c0371

	const result = parser(prTitle, parserOpts);
	core.setOutput('type', result.type);
	core.setOutput('scope', result.scope);
	core.setOutput('subject', result.subject);

Currently the parser doesn't return any information of whether it's a breaking change. If this information is available upstream in the parser, we could return it to an output.