[Unitary-Hack] Feature: Add Delay and Barrier to circuit

[Manvi-Agrawal]

Issue , if available:

Fixes #974

Testing done:

• Unit test coverage is 100%.
• Running this code produces this QASM code

from braket.circuits import Circuit

circ = Circuit().barrier([0, 1, 2])
circ = Circuit().delay([0, 1, 2], 30)

print(circ.to_ir("OPENQASM").source)

OUTPUT

OPENQASM 3.0;
bit[3] b;
qubit[3] q;
delay[30 s] q[0], q[1], q[2];
b[0] = measure q[0];
b[1] = measure q[1];
b[2] = measure q[2];

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