Refactor MASK_CAUSAL parameter to use IS_CAUSAL

[LoserCheems]

Summary

• This change refactors the MASK_CAUSAL parameter to utilize the IS_CAUSAL variable in kernel configurations for both dense and sparse operations.

Root Cause

• The previous implementation used a hardcoded value for MASK_CAUSAL, which could lead to inconsistencies.

Changes

• Updated the MASK_CAUSAL parameter in multiple kernel functions to reference IS_CAUSAL instead of a static True value.

Reproduction

• No specific bug reproduction steps as this is a refactor, but ensure that kernel operations function as expected with the new parameterization.

Tests

• Existing tests should cover the functionality; validation performed through regression testing.

Compatibility

• No backward compatibility issues anticipated.

Checklist

• Linked issue provided
• Adds or updates tests
• Updates docs if needed
• No perf regressions