feat(E2EEncryption): File encryption support

[rodrigok]

Proposed changes (including videos or screenshots)

Issue(s)

Steps to test or reproduce

Further comments

• Move msg to inside content
• Hack to be able to download files on chrome
• Decide if the APIs will be under room domain
• Decide what to show when e2ee is disabled (check skipped test)
• Cronjob to remove temporary files older than X hours
• Mark uploaded files as temporary
• Mark as non temporary when sending the message
• Anonimize file name
• Decide if content will be string and data
• Decide if the key info will be inside the attachment info
• Should simplify the data structure and make it compatible on read?
• Client generated data:
  • Thumbs?
  • Blurred background?
  • Extra file info? Width, Height
• Tests
  • Old format

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is missing the 'stat: QA assured' label

Please fix the issues and try again

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[codecov]

Codecov Report

Attention: Patch coverage is 35.13514% with 72 lines in your changes are missing coverage. Please review.

Project coverage is 55.57%. Comparing base (190d1de) to head (26e2eb8).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #32316      +/-   ##
===========================================
- Coverage    55.59%   55.57%   -0.03%     
===========================================
  Files         2408     2405       -3     
  Lines        52997    53024      +27     
  Branches     10894    10908      +14     
===========================================
+ Hits         29465    29467       +2     
- Misses       20918    20957      +39     
+ Partials      2614     2600      -14     

Flag	Coverage Δ
e2e	55.05% <35.13%> (-0.01%)	⬇️
unit	72.88% <ø> (-0.15%)	⬇️

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