This commit rename the thresholdFactor parameter to reservePercentage to better
reflect its purpose in the TokenCountBatchingStrategy class. It also adds
validation for input parameters including maxInputTokenCount > 0 and
reservePercentage between 0 and 1 for safer initialization.
The change ensures proper parameter validation on TokenCountBatchingStrategy
creation to prevent potential runtime errors from invalid inputs.
0825d52224