Add support to pass additional parameters to the KeyBundle's HTTP client

[jpslopes]

Add 2 tests

[codecov]

Codecov Report

Merging #32 into master will increase coverage by 0.19%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   77.44%   77.63%   +0.19%     
==========================================
  Files          37       37              
  Lines        3657     3658       +1     
  Branches      708      708              
==========================================
+ Hits         2832     2840       +8     
+ Misses        598      591       -7     
  Partials      227      227

Impacted Files	Coverage Δ
src/cryptojwt/key_bundle.py	80.74% <100%> (+1.34%)	⬆️

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