Investigate adding IR Nodes for `linear` and `matmul`

[kevinstephano]

It was noticed that there is a lot of complexity in pattern matching operations and determining if the set of pattern matched nodes equal a linear operation or matmul operation prior to asking Expression Evaluator to process the operation. Therefore, one idea to explore is to add IR nodes for the operations and decompose them later when they specifically come from ops.linear and ops.matmul.

[Priya2698]

PR #2240, #2209 and #2175 add the new IR nodes.