Feature revolt selfhosted

[i-vis]

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use tox -e lint and even tox -e format to autofix what it can)
• Test coverage added (use tox -e minimal)

Changes

I added a schema revolt://{server_api_url}/{bot_token}/{targets} to support self hosted instances of Revolt.Chat, instead of only supporting the official instance. The differentiation of revolt://{server_api_url}/{bot_token}/{targets} and revolt://{bot_token}/{targets} works by detecting if domain ends with /, i.e. %2F. I did this to preserve possibility to use the current scheme so as to avoid breaking changes.

All tests and ruff linting tests seem to pass. I haven't added new tests as I am inexperienced in that regard and anticipate a lot of changes to this PR if it is to be accepted.

Testing

Note: You need to be running a Revolt Chat server. If your api url contains forward slashes replace them with %2F:
revolt.domain.tld/api/ -> revolt.domain.tld%2Fapi%2F

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/i-vis/apprise.git@feature-revolt-selfhosted

# Test out the changes with the following commands:
# this corresponds to api link being {https://}revolt.domain.tld/api/
apprise -t "Test Title" -b "Test Message" \
  revolt://{revolt.domain.tld%2Fapi%2F}/{bot-token}/{channel-id}
  # this corresponds to official revolt chat server api
apprise -t "Test Title" -b "Test Message" \
  revolt://api.revolt.chat/{bot-token}/{channel-id}
# this corresponds to how plugin currently works (also official server api)
apprise -t "Test Title" -b "Test Message" \
  revolt://{bot-token}/{channel-id}

[codecov]

Codecov Report

❌ Patch coverage is 47.36842% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.61%. Comparing base (27091b5) to head (12766e9).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
apprise/plugins/revolt.py	47.36%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1416      +/-   ##
==========================================
- Coverage   99.65%   99.61%   -0.05%     
==========================================
  Files         174      174              
  Lines       22554    22566      +12     
  Branches     3587     3590       +3     
==========================================
+ Hits        22476    22478       +2     
- Misses         70       78       +8     
- Partials        8       10       +2     

Files with missing lines	Coverage Δ
apprise/plugins/revolt.py	93.00% <47.36%> (-7.00%)	⬇️

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