refactor(event_source): centralizing helper functions for query, header and base64

[leandrodamascena]

Issue number: #2424

Summary

Changes

This PR unifies all the helper functions in one file to avoid drifts and fix minor problems in event source data classes.

User experience

There is no change in the user experience.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

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

Acknowledgment

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

Disclaimer: We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.

[heitorlessa]

LGTM after you refactor to use kwargs over args in for get_header_value and get_query_string_value.

[heitorlessa]

Good to go.... still don't have my access fixed :/

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.03 ⚠️

Comparison is base (1d60146) 97.15% compared to head (2dd8310) 97.12%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2496      +/-   ##
===========================================
- Coverage    97.15%   97.12%   -0.03%     
===========================================
  Files          157      158       +1     
  Lines         7345     7346       +1     
  Branches       533      517      -16     
===========================================
- Hits          7136     7135       -1     
  Misses         160      160              
- Partials        49       51       +2     

Impacted Files	Coverage Δ
...wertools/utilities/data_classes/active_mq_event.py	100.00% <100.00%> (ø)
...ities/data_classes/api_gateway_authorizer_event.py	100.00% <100.00%> (ø)
...s/utilities/data_classes/appsync_resolver_event.py	100.00% <100.00%> (ø)
...ls/utilities/data_classes/aws_config_rule_event.py	99.50% <100.00%> (-0.01%)	⬇️
...s/utilities/data_classes/cloud_watch_logs_event.py	100.00% <100.00%> (ø)
.../utilities/data_classes/code_pipeline_job_event.py	100.00% <100.00%> (ø)
...lambda_powertools/utilities/data_classes/common.py	100.00% <100.00%> (ø)
...a_powertools/utilities/data_classes/kafka_event.py	96.96% <100.00%> (+4.32%)	⬆️
...wertools/utilities/data_classes/rabbit_mq_event.py	100.00% <100.00%> (ø)
...wertools/utilities/data_classes/s3_object_event.py	100.00% <100.00%> (ø)
... and 2 more

... and 3 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.