storcon: register Pageserver gRPC address (#12268)

## Problem

Pageservers now expose a gRPC API on a separate address and port. This
must be registered with the storage controller such that it can be
plumbed through to the compute via cplane.

Touches #11926.

## Summary of changes

This patch registers the gRPC address and port with the storage
controller:

* Add gRPC address to `nodes` database table and `NodePersistence`, with
a Diesel migration.
* Add gRPC address in `NodeMetadata`, `NodeRegisterRequest`,
`NodeDescribeResponse`, and `TenantLocateResponseShard`.
* Add gRPC address flags to `storcon_cli node-register`.

These changes are backwards-compatible, since all structs will ignore
unknown fields during deserialization.

storage_controller/src/persistence.rs

@@ -2125,6 +2125,8 @@ pub(crate) struct NodePersistence {
     pub(crate) availability_zone_id: String,
     pub(crate) listen_https_port: Option<i32>,
     pub(crate) lifecycle: String,
+    pub(crate) listen_grpc_addr: Option<String>,
+    pub(crate) listen_grpc_port: Option<i32>,
 }
 
 /// Tenant metadata health status that are stored durably.