Client RPC Endpoints, Server Routing and Streaming RPCs

Add TLS to streaming RPCs

docs: Fix a very small typo

Fix erroneous metrics link + code block typo on the metrics page

This PR fixes an issue where if the client has multiple connections to a
server, a single connection closing would cause the routing to the node
to be lost.

This PR enhances the API package by having client only RPCs route
through the server when they are low cost and for filesystem access to
first attempt a direct connection to the node and then falling back to
a server routed request.