add functions that compute packed reduced qm31 arithmetics to math_utils

Author: ohad-nir-starkware

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 #### Upcoming Changes
 
+* feat: add functions that compute packed reduced qm31 arithmetics to `math_utils` [#1944](https://github.com/lambdaclass/cairo-vm/pull/1944)
+
 * feat: remove `NonZeroReservedBits` from `VirtualMachineError` [#1948](https://github.com/lambdaclass/cairo-vm/pull/1948)
 
 * feat: set `encoded_instruction` to be u128 for opcode_extensions to come [#1940](https://github.com/lambdaclass/cairo-vm/pull/1940)