[REQ] Adding lamdas to improve docs generated files and to make them complying with Markdown rules

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

Many specification files contain fields that violate Markdown rules when generating OpenAPI documentation.

Describe the solution you'd like

I suggest introducing two lambda classes that modify these fields to improve the doc files:

1. TidyLambda for the following changes :

• Replace and normalize all non-standard apostrophes
• Replace and normalize all non-standard quotes
• Replace all HTML break tags with new lines
• Escape all opening/closing brackets
• Normalize spaces
• Normalize new lines (maximum 2 consecutive line breaks)
• Remove new lines at the end

2. MakeSingleLineLambda for the following changes:

• Convert any line breaks into a space

I opened a PR with my suggestion: https://github.com/OpenAPITools/openapi-generator/pull/17761

Describe alternatives you've considered

The specification files can be modified manually, but the code may have other uses beyond the md files.

Review the proposed implementation in PR #17761 first, then trace where generated OpenAPI Markdown documentation processes specification fields. Done means the two requested lambdas are integrated and their normalization behavior is covered for apostrophes, quotes, breaks, brackets, spaces, and newlines.