Add granular APIs to add, delete ebpf programs on a node

[satyaranjanp]

Currently L3AFD supports GET API to get the eBPF programs running on a node and UPDATE API to manage the eBPF programs on a node. Instead of using only UPDATE API for program management, we can segregate the eBPF program orchestration by supporting the below APIs also:

1. ADD: Starts a new eBPF program on a node
2. DELETE: Remove an existing eBPF program from a node

And, we can limit the current scope of UPDATE API to only update/patch configuration of existing eBPF programs on a node.

[dahavey]

@dthaler - We have decided this is a good first issue. Could you please add the tag?

[sanfern]

Implemented - PR 76