chore: assited changelog pre-generation, auto-label PR

[heitorlessa]

Issue #, if available: #439
Fixes: #439

Description of changes:

Uses git-chglog to assist in generating Changelog by fetching all changes since latest tag before editing for human readibility.

make changelog

Checklist

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

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

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 #443 (0e129c3) into develop (bfb67e7) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #443   +/-   ##
========================================
  Coverage    99.90%   99.90%           
========================================
  Files          102      104    +2     
  Lines         4124     4193   +69     
  Branches       205      205           
========================================
+ Hits          4120     4189   +69     
  Misses           1        1           
  Partials         3        3           

Impacted Files	Coverage Δ
...bda_powertools/utilities/parser/models/__init__.py	100.00% <0.00%> (ø)
..._powertools/utilities/parser/envelopes/__init__.py	100.00% <0.00%> (ø)
...a_powertools/utilities/parser/envelopes/apigwv2.py	100.00% <0.00%> (ø)
...mbda_powertools/utilities/parser/models/apigwv2.py	100.00% <0.00%> (ø)

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