terraform: add functionality to init action

[ITProKyle]

Summary

Terraform modules will now run terraform init when using runway init.

What Changed

Added

• added functionality to init action for Terraform modules

[codecov]

Codecov Report

Merging #772 (b5bc81d) into master (f315eba) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #772   +/-   ##
=======================================
  Coverage   87.36%   87.36%           
=======================================
  Files         218      218           
  Lines       13853    13854    +1     
=======================================
+ Hits        12102    12103    +1     
  Misses       1751     1751           

Impacted Files	Coverage Δ
runway/_cli/commands/_deploy.py	84.61% <ø> (ø)
runway/_cli/commands/_destroy.py	87.50% <ø> (ø)
runway/_cli/commands/_init.py	96.15% <ø> (ø)
runway/_cli/commands/_plan.py	84.61% <ø> (ø)
runway/module/terraform.py	100.00% <100.00%> (ø)

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