fix: whitespace being stripped from generateJSON

[asiraky]

Changes Overview

Allows the options to be supplied to the DOM parser which allows one to supply (among other options) preserveWhitespace: true to the parser. There is an outstanding bug where whitespace is being stripped when using generateJSON. This makes importing data into tiptap impossible (for me).

Implementation Approach

Added the parameter as an optional parameter so its entirely opt in.

Testing Done

Ran this on my project and it solved the issue regarding whitespace.

Verification Steps

Ran this on my project and it solved the issue regarding whitespace.

Additional Notes

Checklist

• I have renamed my PR according to the naming conventions. (e.g. feat: Implement new feature or chore(deps): Update dependencies)
• My changes do not break the library.
• I have added tests where applicable.
• I have followed the project guidelines.
• I have fixed any lint issues.

Related Issues

#4432

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[bdbch]

lgtm, thanks!