Introduce new Ansi2json parser

What does this MR do?

Given the size of the original MR !16987 (closed), I've split it in 2 parts.

In this MR we introduce the new Ansi2json side by side to the existing Ansi2html.

In the next MR we will wire it up with the controller and the trace class.

Related issue: #31162 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
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• Style guides
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• Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

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• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
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