[dash-p4] Refactor routing type and routing actions in P4 to make it align more explicitly with the DASH pipeline design.

[r12f]

This commit refactors the table actions in outbound pipeline to make it align more explicitly to how DASH pipeline is modeled today.

The change includes:

• Extract the table actions related to routing types out of the control block into a separate file.
• Split the routing type actions into a list of routing actions.

For how routing types and routing actions work, please refer to the SONiC DASH HLD.

This commit doesn't change any SAI header definitions and libsai (except a few action id change, due to moving actions):

[r12f]

woot! thanks for the review Marian!