Bark - add critical level alert plus ?volume= argument

[pb8DvwQkfRR]

Description:

Critical Alert will ignore silent and Do Not Disturb modes.
Volume range: 0-10.

Finb/Bark@f059fde

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

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/pb8DvwQkfRR/apprise.git@bark-critical

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  bark://api.day.app/<device_key>/?level=critical&volume=1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.37%. Comparing base (f37dfbf) to head (1ce1981).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1239    +/-   ##
========================================
  Coverage   99.36%   99.37%            
========================================
  Files         147      148     +1     
  Lines       20555    20660   +105     
  Branches     3663     3680    +17     
========================================
+ Hits        20425    20530   +105     
  Misses        121      121            
  Partials        9        9            

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[caronc]

Hi, is this ready to go?

[caronc]

Merged