Fix redundant ConditionExpression parentheses validation

[SergioChan]

Summary

• reject redundant boolean-group parentheses in DynamoDB condition expressions when the grouped clause does not change precedence (for example a OR (b AND c))
• raise InvalidConditionExpression with AWS-aligned message The expression has redundant parentheses;
• add regression coverage for both the rejected redundant case and an allowed precedence-changing case (a AND (b OR c))

Testing

• python -m pytest tests/test_dynamodb/test_dynamodb_condition_expressions.py -k "redundant_parentheses or allows_required_parentheses"
• python -m pytest tests/test_dynamodb/test_dynamodb_condition_expressions.py

Related

Fixes #9574

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.12%. Comparing base (c7b3d3c) to head (bd93d0a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9847   +/-   ##
=======================================
  Coverage   93.12%   93.12%           
=======================================
  Files        1308     1308           
  Lines      118884   118900   +16     
=======================================
+ Hits       110706   110723   +17     
+ Misses       8178     8177    -1     

Flag	Coverage Δ
servertests	28.89% <88.23%> (+<0.01%)	⬆️
unittests	93.09% <100.00%> (+<0.01%)	⬆️

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[bpandola]

@SergioChan Thanks. Nice work.