Add string array context params

[alexgromero]

This PR adds support for stringArray parameters and introduces the operationContextParams trait.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 93.17%. Comparing base (b1279af) to head (ce7511a).
Report is 93 commits behind head on develop.

Files with missing lines	Patch %	Lines
botocore/regions.py	66.66%	3 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3301      +/-   ##
===========================================
- Coverage    93.18%   93.17%   -0.01%     
===========================================
  Files           66       66              
  Lines        14345    14389      +44     
===========================================
+ Hits         13367    13407      +40     
- Misses         978      982       +4     

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