Higher order primitives can take in dynamically allocated registers

[paul0403]

Context:
Higher order primitives can take in dynamically allocated registers

Description of the Change:

• changelog
• remove the restriction from docs
• general case (initial solution is a prototype for just one register coming in)
• cond
• for loop
• while loop
• adjoint
• subroutine

Benefits:

Possible Drawbacks:
Don't know why, but while other subregions have arg signature (args, qreg), subroutine has signature (qreg, args), i.e. it has args in reverse order. This means the subregion wrapper (the thing to be make_jaxpr'd) cannot be reused for subroutines.
This is probably something we can just reorder?

Also, subroutine takes in wire indices through tracer args of the subroutine, even when the indices are static. This means its qreg_map logic between inner qregs and outer qregs is different than the others.

Related GitHub Issues:
[sc-99734]