Add various impls for new squin statements

[david-pl]

#335 introduced two new statements, SqrtX and SqrtY. These need to be supported in

• the pyqrack interpreter method table
• the cirq emit

FYI, @kaihsin @johnzl-777 am I missing any?

[kaihsin]

nope, #335 only add two statements SqrtX and SqrtY

[kaihsin]

SqrtZ is (binding/wrapper), which binds to op.S

[david-pl]

Also, we can add an additional check for the exponent in the lowering of cirq's XPowGate and YPowGate, similar to what we already have for the ZPowGate.