URL Redirections (from 3xx responses) can now be disabled

[caronc]

Description

Related issue (if applicable): caronc/apprise#1610

Note: this PR is actually 100% complete but can not be merged until a new build of Apprise is created following versioning (v1.11.0). Once the an update to Apprise has been made, this Apprise API can be safely merged (without build errors); it is directly dependant on caronc/apprise#1610

Checklist

• Documentation ticket created (if applicable): apprise-docs/60
• The change is tested and works locally.
• No commented-out code in this PR.
• No lint errors (use tox -e lint and optionally tox -e format).
• Test coverage added or updated (use tox -e test).

Testing

Anyone can help test as follows:

# Clone the branch
git clone -b url-redirect-env-support ttps://github.com/caronc/apprise-api.git
cd apprise-api

# Run the unit tests
tox -e test

# Run a local instance of the api at http://localhost:8000
tox -e runserver

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b31235b) to head (d7102dc).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #331   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines         1424      1424           
  Branches       254       254           
=========================================
  Hits          1424      1424           

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