[Optimizer] Support context shift with multiple rules with the same source gate type #168
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This PR supports context shift with multiple rules with the same source gate type, e.g.,
"rz q0 0.25pi = t q0", "rz q0 -0.25pi = tdg q0"
, and also supports constant parameters increate_single_gate_GraphXfer
(this feature was already supported increate_GraphXfer_from_qasm_str
).This PR also does some codebase cleaning, and adds a test to
test_context_shift
.