RFC-0005 Phase 2, annotated string functions and added tests.#1

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RFC_5_UDF_STATS_PHASE_2

Commits on Oct 15, 2024

Phase 1. Implementation for RFC-0005: Scalar function stats propagation.
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Commits on Oct 24, 2024

1. Annotated the scalar functions in `StringFunctions` and `MathFunctions` class, with `ScalarFunctionConstantStats` and `ScalarPropagateSourceStats` .
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Disabled the tests for substr functions.
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