Added placement to runtime PassManager

Mccaskey, Alexrequested to merge
github/fork/tnguyen-ornl/tnguyen/placement into master

Created by: tnguyen-ornl

Added 2 CLI options: -qubit-map and -placement.

Usage:

  • -qubit-map 3,4,2,1,0 to pass a qubit map => default-placement will always be used.

  • If no -qubit-map, default placement of swap-shortest-path will be used only if the qpu has connectivity graph defined. Other connectivity-based placement plugins can be used instead by passing a name to -placement.

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