ENH: Added SimpleTokenCache

[snowman2]

• Closes ENH: Serializable Token Cache #5
• Tests added
• Fully documented

[codecov]

Codecov Report

Merging #6 (bcc5803) into master (2af799a) will increase coverage by 1.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   95.45%   96.62%   +1.17%     
==========================================
  Files           7        8       +1     
  Lines          66       89      +23     
==========================================
+ Hits           63       86      +23     
  Misses          3        3              

Impacted Files	Coverage Δ
msal_requests_auth/cache.py	100.00% <100.00%> (ø)

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