[CLIENT-4836] Add support for string operations and expressions

[juliannguyen4]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 128 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.67%. Comparing base (da9715f) to head (1ec6311).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
aerospike_helpers/operations/string_operations.py	0.00%	88 Missing ⚠️
aerospike_helpers/expressions/string.py	0.00%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1072      +/-   ##
==========================================
- Coverage   84.44%   83.67%   -0.77%     
==========================================
  Files          99      101       +2     
  Lines       14062    14190     +128     
==========================================
  Hits        11874    11874              
- Misses       2188     2316     +128     

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