improv: keeps Lambda root logger handler, and add log filter instead to prevent child log records duplication

[heitorlessa]

Issue #, if available: #194

Description of changes:

This PR adds a log filter in the root logger to reject any log record coming from our Logger - This will prevent child logger to propagate log records to their parents as well as root loggers leading to duplicated log entries.

This unblocks issue described in 194 when customers assume root logger to be configured as per Lambda docs.

Checklist

• Meet tenets criteria
• Update logger test
• Update docs to reflect that
• 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-io]

Codecov Report

Merging #198 into develop will decrease coverage by 0.08%.
The diff coverage is 83.33%.

@@             Coverage Diff             @@
##           develop     #198      +/-   ##
===========================================
- Coverage    99.87%   99.79%   -0.09%     
===========================================
  Files           65       66       +1     
  Lines         2451     2460       +9     
  Branches       108      110       +2     
===========================================
+ Hits          2448     2455       +7     
- Misses           3        4       +1     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
aws_lambda_powertools/logging/filters.py	75.00% <75.00%> (ø)
aws_lambda_powertools/logging/logger.py	100.00% <100.00%> (ø)

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