chore: add cache headers to storage proxies

[BlankParticle]

What does this PR do?

Add Cache headers to storage to cache avatar and attachments on user's browser

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]

• chore: add cache headers to storage proxies #762 👈
• main

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[McPizza0]

why
avatars are already cached by default in browsers
attachments are not needed to be cached since theyre super rarely opened

[BlankParticle]

Avatars are cached until the page is closed, we need to cache them between reloads
about attachments, inline images are also attachments, so we need to cache them so that we dont call our storage everytime we load them

[BlankParticle]

Merge activity

• Sep 1, 5:25 AM EDT: @BlankParticle merged this pull request with Graphite.