test(parser): Add missing test coverage and lint changes

[michaelbrewer]

Issue #, if available:

Description of changes:

• Make some methods static
• Run code formatter
• Some lint based changes
• Add missing test cases

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #188 into develop will increase coverage by 0.44%.
The diff coverage is 80.00%.

@@             Coverage Diff             @@
##           develop     #188      +/-   ##
===========================================
+ Coverage    98.76%   99.20%   +0.44%     
===========================================
  Files           64       64              
  Lines         2501     2503       +2     
  Branches       111      111              
===========================================
+ Hits          2470     2483      +13     
+ Misses          24       14      -10     
+ Partials         7        6       -1     

Impacted Files	Coverage Δ
...owertools/utilities/advanced_parser/schemas/sqs.py	84.00% <33.33%> (ø)
...rtools/utilities/advanced_parser/envelopes/base.py	90.62% <100.00%> (+20.62%)	⬆️
...ls/utilities/advanced_parser/envelopes/dynamodb.py	100.00% <100.00%> (ø)
...ools/utilities/advanced_parser/schemas/dynamodb.py	100.00% <100.00%> (+6.06%)	⬆️
...ertools/utilities/advanced_parser/envelopes/sqs.py	100.00% <0.00%> (+17.64%)	⬆️

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[michaelbrewer]

@heitorlessa - one thing I did pick up from the "schema" package was user specific examples. Should we move some of that into an examples or docs ?

[heitorlessa]

@heitorlessa - one thing I did pick up from the "schema" package was user specific examples. Should we move some of that into an examples or docs ?

They'll be in the docs. They're similar to the data classes, except they can be inherited and overridden so we can parse the entire payload + user defined models for autocompletion, etc.

Here's the list of other changes to be made before we launch 1.7.0 with it - Coverage and linting were some of them, so big thank you ;): #118 (comment)