feat: migrate from mimetext to mail-composer for raw emails

[BlankParticle]

What does this PR do?

replacing mimetext with nodemailer's mail-composer as it seems to be better in terms of following the rfc

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]

• feat: migrate from mimetext to mail-composer for raw emails #757 👈
• main

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[BlankParticle]

Merge activity

• Aug 30, 12:46 AM EDT: @BlankParticle merged this pull request with Graphite.