refactor: add functions to get parameters and add constants

[aramase]

Signed-off-by: Anish Ramasekar anish.ramasekar@gmail.com

Reason for Change:

• Adds functions to get parameters from the attributes map
• Adds unit tests to validate the get parameters functions
• Makes the parameter names constant, so it can be reused in code and tests

Requirements

• squashed commits
• included documentation
• added unit tests and e2e tests (if applicable).

Issue Fixed:

Does this change contain code from or inspired by another project?

• Yes
• No

If "Yes," did you notify that project's maintainers and provide attribution?

Special Notes for Reviewers:

[codecov-commenter]

Codecov Report

Merging #896 (e17c342) into master (e0ff59e) will increase coverage by 1.21%.
The diff coverage is 90.36%.

@@            Coverage Diff             @@
##           master     #896      +/-   ##
==========================================
+ Coverage   59.79%   61.00%   +1.21%     
==========================================
  Files           7        8       +1     
  Lines         868      895      +27     
==========================================
+ Hits          519      546      +27     
  Misses        314      314              
  Partials       35       35              

[aramase]

/azp run pr-e2e-azure

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Azure Pipelines successfully started running 1 pipeline(s).

[aramase]

/azp run pr-e2e-azure

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).