feat(mailtools): add playground, refactor signature extractions

[McPizza0]

What does this PR do?

Fixes #120 #121

This pr introduces a playground for local testing of the mailtools package

we have also split out the signature parser from the quotations parser
it now returns the parsed signatures in plain text and html

and the cleanstyles function can now accept an array of styles to remove, or if set to true will remove default styles

NOT DONE:
tests were not added for the new stuff...

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (refactoring code, technical debt, workflow improvements)
• Enhancement (small improvements)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

Required

• Read Contributing Guide
• Self-reviewed my own code
• Tested my code in a local environment
• Commented on my code in hard-to-understand areas
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the UnInbox Docs if changes were necessary

[BlankParticle]

Everything else looks good, I didn't have time to look at everything else as I am busy with recovery codes stuff. I hope you have tested everything yourself.
Other than that its ok to merge. I will take care of updating the tests later