[AIRFLOW-6083] Add custom configuration to AWS lambda client

[Daumis102]

Make sure you have checked all steps below.

Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-6083
  • In case you are fixing a typo in the documentation you can prepend your commit with [AIRFLOW-XXX], code changes always need a Jira issue.
  • In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal (AIP).
  • In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.

Description

• Here are some details about my PR, including screenshots of any UI changes:
  My PR adds ability to provide Lambda client with custom configuration.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason: It does not need testing as the functionality that was already implemented in function get_client_type was defaulting config param to None, which I also do in case no config is provided to AwsLambdaHook constructor. If config is provided, then the only thing I do is pass it to the client creation function, which already has everything else implemented.

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain docstrings that explain what it does
  • If you implement backwards incompatible changes, please leave a note in the Updating.md so we can assign it to a appropriate release

[codecov-io]

Codecov Report

Merging #6678 into master will decrease coverage by 0.32%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6678      +/-   ##
==========================================
- Coverage   83.86%   83.53%   -0.33%     
==========================================
  Files         668      668              
  Lines       37537    37538       +1     
==========================================
- Hits        31479    31356     -123     
- Misses       6058     6182     +124

Impacted Files	Coverage Δ
...flow/providers/amazon/aws/hooks/lambda_function.py	100% <100%> (ø)	⬆️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	78.2% <0%> (-20.52%)	⬇️
airflow/configuration.py	89.13% <0%> (-3.63%)	⬇️
airflow/jobs/backfill_job.py	89.9% <0%> (-1.53%)	⬇️
airflow/utils/dag_processing.py	58.15% <0%> (+0.16%)	⬆️

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[OmerJog]

Ready to merge?