[CLIENT-3651] Fix passing empty list or none to ctx param failing for Query.where(), client.index_cdt_create(), and all operations that have a ctx parameter

[juliannguyen4]

• This approach creates a separate helper function to retrieve and convert a Python list of contexts from a dictionary. All operations that take in a ctx will use this new helper function
• The original helper function now only accepts a Python list of contexts

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (6739ae7) to head (1ee6751).
⚠️ Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/main/client/cdt_list_operate.c	0.00%	34 Missing ⚠️
src/main/conversions.c	0.00%	12 Missing ⚠️
src/main/client/cdt_map_operate.c	0.00%	4 Missing ⚠️
src/main/query/where.c	0.00%	4 Missing ⚠️
src/main/convert_expressions.c	0.00%	3 Missing ⚠️
src/main/client/get_cdtctx_base64.c	0.00%	1 Missing ⚠️
src/main/client/sec_index.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #903       +/-   ##
==========================================
- Coverage   83.37%   0.00%   -83.38%     
==========================================
  Files          99      80       -19     
  Lines       14389   12483     -1906     
==========================================
- Hits        11997       0    -11997     
- Misses       2392   12483    +10091     

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