Allow for loops with arbitrary variable type

[anuragm]

This pull request enables for loops over arbitrary kinds of arrays. For example, one might desire to loop over some float value. This can be done using the following snippet:

import oqpy

program = oqpy.Program()
port = oqpy.PortVar("my_port")
frame = oqpy.FrameVar(port, 3e9, 0, "my_frame")

frequencies = [0.1, 0.2, 0.5]
with oqpy.ForIn(program, frequencies, "frequency", oqpy.FloatVar) as f:
    program.set_frequency(frame, f)

which outputs the following QASM program:

OPENQASM 3.0;
port my_port;
frame my_frame = newframe(my_port, 3000000000.0, 0);
for float frequency in {0.1, 0.2, 0.5} {
  set_frequency(my_frame, frequency);
}

[CLAassistant]

All committers have signed the CLA.

[PhilReinhold]

Looks good to me. I'll leave it to @jcjaskula-aws to merge after final approval

[jcjaskula-aws]

After giving more thoughts about it, it looks good to me. Approving. Thanks for helping.