Add ability for noecho override

[leohoare]

Issue #19

Description of changes:
Have loved using this helper for custom resources, although a big of a shame it's missing the NoEcho.
this would provide basic functionality to override NoEcho such as:
helper.NoEcho = True
I'm happy to add in some tests and update docs/provide an example. I'm just gaining initial opinions on the approach.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #38 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   94.43%   94.44%           
=======================================
  Files           8        8           
  Lines         647      648    +1     
  Branches       44       44           
=======================================
+ Hits          611      612    +1     
  Misses         23       23           
  Partials       13       13           

Impacted Files	Coverage Δ
crhelper/resource_helper.py	90.00% <100.00%> (+0.04%)	⬆️

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[leohoare]

@jaymccon are you still moderating this project? would be nice to have this functionality.

[ddaubi]

This is a must for secure deployment.

[tjbrockmeyer]

@jaymccon This is a good change. Can this get pulled in? It's been since May 2020

[zdot]

Would be great to get this merged.

[zdot]

@jaymccon Thank you! Appreciate your work on this project.

[ddaubi]

Thank you!