Add read/write_trusted_accounts parameters

[adanaja]

The parameter trusted_accounts of BucketWithRoles only allows to pass a list of accounts to be trusted both for read access and write access. However, it may sometimes be desirable to only trust an account for read access. Here we add two parameters that can be used to trust additional accounts only for read access or write access

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (2fa81ec) 83.69% compared to head (6ca7c26) 83.71%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
+ Coverage   83.69%   83.71%   +0.01%     
==========================================
  Files          47       47              
  Lines        3839     3843       +4     
==========================================
+ Hits         3213     3217       +4     
  Misses        626      626              

Files	Coverage Δ
src/e3/aws/troposphere/s3/__init__.py	90.32% <100.00%> (+0.66%)	⬆️

... and 1 file with indirect coverage changes

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