Add Blink Mini arming control

[mstratford]

Description:

Based on @macleajb's work in #366

Adds camera arming support to Blinkpy.

I'm not sure how well Blink Mini is covered in the test framework, but if it's needed for this, I can look into it.

Related issue (if applicable): fixes #366

Checklist:

• Local tests with tox run successfully PR cannot be meged unless tests pass
• Changes tested locally to ensure platform still works as intended
• Tests added to verify new code works

[mstratford]

Tested this on my local home assistant.

[codecov]

Codecov Report

Merging #546 (bf45211) into dev (f755855) will decrease coverage by 0.15%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##              dev     #546      +/-   ##
==========================================
- Coverage   86.38%   86.23%   -0.16%     
==========================================
  Files           8        8              
  Lines        1058     1061       +3     
==========================================
+ Hits          914      915       +1     
- Misses        144      146       +2     

Flag	Coverage Δ
unittests	86.23% <40.00%> (-0.16%)	⬇️

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Impacted Files	Coverage Δ
blinkpy/camera.py	84.40% <25.00%> (-0.84%)	⬇️
blinkpy/api.py	64.58% <100.00%> (ø)

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[fronzbot]

Looks good, thanks for the PR! Sorry it took so long to review 😬

[swerb73]

Any chance anyone tested this with the doorbell?