Prototype conversion flow

[TheGupta2012]

• Implement a basic transformation prototype to convert an unrolled program into the specified target basis set.

• For starting out, take the clifford set for this conversion -

  • Store the clifford decompositions of each gate in pyqasm
  • unroll the program into pyqasm default set
  • For each gate in the program which belongs to default set, convert it into its clifford equivalent using the "stored" definition, if gate is non-parameterized.
  • If the gate is parameterized, "generate" the clifford decomposition
  • Append this definition to the rebased program
  • Convert all default gates using above steps

[TheGupta2012]

Completed as part of #123