Robust numeric op selection & FP detection

[yuvimittal]

Summary

Arithmetic/comparisons only check float32; double/half fall into integer ops so Add helpers is_fp(ty) and is_int(ty). Use them across + - * / < > <= >= == !=.

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[Eshaan-byte]

Hi @yuvimittal! I'd like to work on this issue.

I just completed #137 which fixed the float detection part by replacing FLOAT_TYPE checks with is_fp_type().

For this issue, I can add the complementary is_int_type() helper function and ensure both helpers are used consistently across all arithmetic and comparison operators (+, -, *, /, <, >, <=, >=, ==, !=).

Let me know if this is still needed or if my previous PR (#146) already addressed part of this! Happy to expand the work if needed.