Document support for different application traffic types

[shashankram]

**Please describe what should be documented
The different supported application traffic types should be documented. Currently, HTTP, TCP, and gRPC applications have been tested. Document how the application protocol is inferred by OSM to allow traffic filtering and routing.

**Please suggest where in the repo the document should be located
Possibly: https://docs.openservicemesh.io/docs/tasks_usage/traffic_management/

However, this could also be under a folder that describes application requirements and feature support.

[shashankram]

Partly documented at https://docs.openservicemesh.io/docs/guides/app_onboarding/app_protocol_selection/.

Issue is open to track documentation for how policies and services need to be configured for different application protocols.

[shashankram]

App protocol selection is documented at https://main--osm-docs.netlify.app/docs/guides/app_onboarding/app_protocol_selection/, which describes support for different application traffic protocols.

Additionally, TCP traffic demo has been added at https://main--osm-docs.netlify.app/docs/demos/tcp_traffic_routing/