Feature: Unit Test Cloudformation Templates

[shadycuz]

This PR adds the ability to test a Cloudformation Template without deploying it. It currently only supports YAML templates but support for JSON should be easy to add. I have also not implemented all the Cloudformation intrinsic functions or pseudo variables but they too should be easy to add in a manner that will work for 95% of use cases.

[codecov]

Codecov Report

Merging #5 (479b5c2) into develop (36bdf00) will increase coverage by 0.76%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop       #5      +/-   ##
===========================================
+ Coverage    98.71%   99.47%   +0.76%     
===========================================
  Files            3        5       +2     
  Lines           78      192     +114     
  Branches         8       35      +27     
===========================================
+ Hits            77      191     +114     
  Partials         1        1              

Impacted Files	Coverage Δ
src/cloud_radar/unit_test/__init__.py	100.00% <100.00%> (ø)
src/cloud_radar/unit_test/template.py	100.00% <100.00%> (ø)

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