[TorchToLinalg] Refactor replication pad 1d/2d/3d to share common implementation (#4282)

The change refactors implementations of ReplicationPad1d/2d/3d to share
common utility functions. The newly added utility function
replicationPad takes numDims as input and does ReplicationPad for
1d/2d/3d

Fixes #4254

Author: vinitdeodhar