[Frontend] Add support for Hamiltonian with integer coefficients

[maliasadi]

Context:
Catalyst doesn’t support Hamiltonians with integer coefficients (coeffs with int element type) while this is supported in PennyLane. There are more use cases for this type of Hamiltonians in particular for qml.sum where they're converted to PL Hamiltonian data-types with integer coefficients. (e.g., qml.PauliZ(0) + qml.PauliZ(1) is converted to H([1,1], [Z(0), Z(1)])).

This PR adds this support with updating the Hamiltonian primitive.

[sc-41351]

[codecov]

Codecov Report

Merging #248 (51f0186) into main (0d97a18) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   99.24%   99.24%           
=======================================
  Files          38       38           
  Lines        6718     6724    +6     
  Branches      340      341    +1     
=======================================
+ Hits         6667     6673    +6     
  Misses         28       28           
  Partials       23       23           

Files Changed	Coverage Δ
frontend/catalyst/jax_primitives.py	97.01% <100.00%> (+0.02%)	⬆️

[dime10]

Thanks @maliasadi 💯