feat: Static Types for AWS Lambda

[Nr18]

Issue #, if available: #144

Description of changes:

Provide static types for the event and context arguments of an AWS Lambda handler

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 #149 into develop will decrease coverage by 2.15%.
The diff coverage is 78.88%.

@@             Coverage Diff             @@
##           develop     #149      +/-   ##
===========================================
- Coverage   100.00%   97.84%   -2.16%     
===========================================
  Files           28       33       +5     
  Lines          793      883      +90     
  Branches        72       72              
===========================================
+ Hits           793      864      +71     
- Misses           0       19      +19     

Impacted Files	Coverage Δ
...ties/typing/lambda_client_context_mobile_client.py	76.19% <76.19%> (ø)
...rtools/utilities/typing/lambda_cognito_identity.py	77.77% <77.77%> (ø)
...mbda_powertools/utilities/typing/lambda_context.py	78.57% <78.57%> (ø)
...wertools/utilities/typing/lambda_client_context.py	80.00% <80.00%> (ø)
aws_lambda_powertools/utilities/typing/__init__.py	100.00% <100.00%> (ø)

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[randude]

@heitorlessa we've been using https://pypi.org/project/aws-lambda-context/ for the lambda context static typing. it's the same thing i guess.

[Nr18]

@randude I actually am using that package today, but I wanted to start with this first then look at the gap between them.

[to-mc]

LGTM

[heitorlessa]

Thanks again @Nr18 for another contribution :) Merging now, and it should be out tomorrow on 1.5.0 release \ o /

[michaelbrewer]

@Nr18 @heitorlessa - made some changes by adding tests (for cheques and balances ;) )

[Nr18]

Thanks @michaelbrewer