fix: Get Object should return both list and dict

[thomaspoignant]

This PR

• add the possibility for providers to return both dict and list while calling get_object_* functions.

Related Issues

Fixes #63

[codecov-commenter]

Codecov Report

Merging #64 (83e4f9b) into main (4eee603) will decrease coverage by 0.23%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   92.92%   92.69%   -0.24%     
==========================================
  Files          18       19       +1     
  Lines         325      342      +17     
==========================================
+ Hits          302      317      +15     
- Misses         23       25       +2     

Flag	Coverage Δ
unittests	92.69% <92.30%> (-0.24%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
open_feature/provider/no_op_provider.py	100.00% <ø> (ø)
open_feature/provider/provider.py	75.00% <ø> (ø)
open_feature/immutable_dict/mapping_proxy_type.py	83.33% <83.33%> (ø)
open_feature/flag_evaluation/flag_type.py	100.00% <100.00%> (ø)
open_feature/open_feature_client.py	96.47% <100.00%> (+0.17%)	⬆️

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