test: improve types coverage

[KKould]

Summary

• add Codecov coverage generation/upload support and non-blocking PR coverage comments
• add focused unit tests for DataValue comparison/accessor behavior
• add cast_create dispatch coverage for boolean, float/double, utf8, chrono, tuple, and decimal casts

Tests

• cargo test -p kite_sql types::value::test:: --features decimal
• cargo test -p kite_sql types::evaluator::cast::test:: --features decimal
• make test
• make codecov

[codecov]

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