Add support for Character endpoints

[bpepple]

The following Character endpoints were added:

• Comics
• Events
• Series
• Stories

[codecov-commenter]

Codecov Report

Merging #24 (9f4717d) into master (eedcaf3) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   95.65%   95.89%   +0.23%     
==========================================
  Files          23       23              
  Lines        1267     1341      +74     
==========================================
+ Hits         1212     1286      +74     
  Misses         55       55              

Flag	Coverage Δ
unittests	95.89% <100.00%> (+0.23%)	⬆️

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Impacted Files	Coverage Δ
esak/session.py	94.35% <100.00%> (+0.50%)	⬆️
tests/character_test.py	100.00% <100.00%> (ø)

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