fix: remove unnecessary typing-extensions for py3.8

[nadobando]

Issue #280

Description of changes:

1. Added if block to know if typing_extensions should be imported based on the python version.
   if python >= 3.8 typing extensions will not be imported and the native implementation will be used
   else will try to import typing_extensions and catch the ImportError

2. Updated modules which imported this dependency.

3. Updated pyproject.toml to only install typing-extensions when python version is <3.8
   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-io]

Codecov Report

Merging #281 (fc78bea) into develop (575a103) will decrease coverage by 0.06%.
The diff coverage is 84.61%.

@@             Coverage Diff             @@
##           develop     #281      +/-   ##
===========================================
- Coverage    99.75%   99.68%   -0.07%     
===========================================
  Files           79       79              
  Lines         2839     2861      +22     
  Branches       118      120       +2     
===========================================
+ Hits          2832     2852      +20     
- Misses           5        7       +2     
  Partials         2        2              

Impacted Files	Coverage Δ
aws_lambda_powertools/utilities/parser/types.py	80.00% <71.42%> (-20.00%)	⬇️
...bda_powertools/utilities/parser/models/dynamodb.py	100.00% <100.00%> (ø)
...mbda_powertools/utilities/parser/models/kinesis.py	100.00% <100.00%> (ø)
...ws_lambda_powertools/utilities/parser/models/s3.py	100.00% <100.00%> (ø)
...s_lambda_powertools/utilities/parser/models/ses.py	100.00% <100.00%> (ø)
...s_lambda_powertools/utilities/parser/models/sns.py	100.00% <100.00%> (ø)
...s_lambda_powertools/utilities/parser/models/sqs.py	100.00% <100.00%> (ø)
aws_lambda_powertools/utilities/batch/sqs.py	100.00% <0.00%> (ø)
aws_lambda_powertools/utilities/batch/base.py	100.00% <0.00%> (ø)
...ws_lambda_powertools/utilities/batch/exceptions.py	100.00% <0.00%> (ø)

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[to-mc]

Nice change, great to keep the package size down where we can! Added a small suggestion to change - otherwise LGTM!

[heitorlessa]

Thanks a lot for this contribution @nadobando !!! And thanks @cakepietoast for the review. Merging this and publishing a new release