Move generated binapi

[ondrej-fabry]

This issue tracks progress for moving the generated Go bindings located currently in binapi directory outside of the main module.

List of tasks related to this:

• remove all dependency on binapi packages from the GoVPP client code

Considering these approaches:

1. move the binapi folder under examples and make examples a Go sub-module

• this way we still keep the generated code for the purpose of comparing changes to generator
• allows examples to still use the generated code for the usage demonstration
• will require examples to depend on main module (go.fd.io/govpp) - specific version or local replace

2. remove the binapi folder from master branch and use dedicated branch(es) containing only the generated code

• this way we could generated binapi code for multiple VPP versions, either separate branches for each version: binapi/2202, binapi/2210.. or single branch binapi with directory for each VPP version