Add BucketWithRoles construct

[pierretr]

This construct provides a bucket and its associated access roles and
policies.

TN: V620-043

[codecov]

Codecov Report

Merging #140 (1d852c3) into master (aca1392) will increase coverage by 0.11%.
The diff coverage is 83.87%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
+ Coverage   78.18%   78.29%   +0.11%     
==========================================
  Files          42       43       +1     
  Lines        3310     3341      +31     
==========================================
+ Hits         2588     2616      +28     
- Misses        722      725       +3     

Impacted Files	Coverage Δ
src/e3/aws/troposphere/s3/__init__.py	83.87% <83.87%> (ø)
src/e3/aws/troposphere/iam/policy_statement.py	85.71% <0.00%> (+4.76%)	⬆️

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