Add new endpoint to get user info

[fronzbot]

Description:

Adds an endpoint that seems to provide similar info to the login method

[codecov]

Codecov Report

Merging #280 into dev will decrease coverage by 0.18%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##              dev     #280      +/-   ##
==========================================
- Coverage   82.19%   82.01%   -0.19%     
==========================================
  Files           8        8              
  Lines         792      795       +3     
==========================================
+ Hits          651      652       +1     
- Misses        141      143       +2     

Flag	Coverage Δ
#unittests	82.01% <33.33%> (-0.19%)	⬇️

Impacted Files	Coverage Δ
blinkpy/api.py	61.90% <33.33%> (-1.06%)	⬇️

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