get_dynamodb method

[epps]

Description

This PR adds the get_dynamodb method to the Python client for fetching previously registered DynamoDB providers.

Type of change

Select type(s) of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have fixed any merge conflicts

[codecov]

Codecov Report

Attention: 273 lines in your changes are missing coverage. Please review.

Comparison is base (7fdb3ec) 49.27% compared to head (68fbff0) 61.04%.
Report is 245 commits behind head on main.

Files	Patch %	Lines
client/src/featureform/serving.py	26.31%	81 Missing and 3 partials ⚠️
client/src/featureform/register.py	77.14%	35 Missing and 13 partials ⚠️
client/src/featureform/resources.py	73.21%	45 Missing ⚠️
client/src/featureform/deploy.py	62.39%	34 Missing and 10 partials ⚠️
client/src/featureform/cli.py	49.01%	26 Missing ⚠️
client/src/featureform/client.py	10.00%	17 Missing and 1 partial ⚠️
client/src/featureform/status_display.py	40.00%	3 Missing ⚠️
client/src/featureform/feature_flag.py	66.66%	1 Missing and 1 partial ⚠️
client/src/featureform/tls.py	50.00%	2 Missing ⚠️
client/src/featureform/enums.py	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1309       +/-   ##
===========================================
+ Coverage   49.27%   61.04%   +11.76%     
===========================================
  Files         117       26       -91     
  Lines       21903     4379    -17524     
  Branches        0      647      +647     
===========================================
- Hits        10793     2673     -8120     
+ Misses      10383     1584     -8799     
+ Partials      727      122      -605     

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