Unicode Support, Between Support and Testing

[gilsonjoanelo]

Merge conflict resolved.

1. Add isUnicode parameter to StringLiteralQueryType function
2. Update code to use ternary operator

Test implementation

1. NorthwindAggregateOperatorsQueryFbTest: Contains_with_local_collection_sql_injection
2. NorthwindMiscellaneousQueryFbTest: Contains_over_concatenated_columns_both_fixed_length

Unicode support

Correção do erro Implementation limit exceeded

Add isUnicode parameter to StringLiteralQueryType function

[gilsonjoanelo]

This PR introduces support for translating binary expressions of the form:

column >= min && column <= max

into the Firebird SQL BETWEEN operator:

column BETWEEN min AND max

Changes included:

• Override of VisitBinary in the Firebird QuerySqlGenerator to detect the >= and <= pattern on the same column and emit BETWEEN.
• Added functional tests in SqlQueryFbTest to validate that queries using >= && <= are correctly translated into BETWEEN.
• Added negative tests to ensure that BETWEEN is not generated when:
• Different columns are used in the comparisons.
• Only one side of the comparison (>= or <=) is present.
  Motivation:
  Firebird supports the BETWEEN operator natively, and translating this common LINQ pattern improves readability and efficiency of generated SQL.