Feature: Allow mail account to use access tokens

[stumpylog]

Proposed change

Allows a user to provide an access token for mail account authentication, instead of using a password. This is a new checkbox, since there's no way to tell the password is a token.

The source of the token is up to the user, depending on their mail account and server, etc.

#2296 #2707

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

Merging #2930 (32076d9) into dev (4637e33) will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #2930      +/-   ##
==========================================
+ Coverage   93.17%   93.46%   +0.29%     
==========================================
  Files         153      154       +1     
  Lines        6445     6595     +150     
==========================================
+ Hits         6005     6164     +159     
+ Misses        440      431       -9     

Flag	Coverage Δ
backend	93.46% <100.00%> (+0.29%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/paperless_mail/serialisers.py	98.07% <ø> (ø)
src/paperless_mail/mail.py	88.51% <100.00%> (+0.11%)	⬆️
...rless_mail/migrations/0020_mailaccount_is_token.py	100.00% <100.00%> (ø)
src/paperless_mail/models.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[shamoon]

Cool. Tiny stuff on the frontend. Should this also be mentioned in the docs?

[github-actions]

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