storcon: use https for pageservers (#10759)

## Problem

Storage controller uses unsecure http for pageserver API.

Closes: https://github.com/neondatabase/cloud/issues/23734
Closes: https://github.com/neondatabase/cloud/issues/24091

## Summary of changes

- Add an optional `listen_https_port` field to storage controller's Node
state and its API (RegisterNode/ListNodes/etc).
- Allow updating `listen_https_port` on node registration to gradually
add https port for all nodes.
- Add `use_https_pageserver_api` CLI option to storage controller to
enable https.
- Pageserver doesn't support https for now and always reports
`https_port=None`. This will be addressed in follow-up PR.

storage_controller/src/main.rs

@@ -126,6 +126,10 @@ struct Cli {
 
     #[arg(long)]
     long_reconcile_threshold: Option<humantime::Duration>,
+
+    // Flag to use https for requests to pageserver API.
+    #[arg(long, default_value = "false")]
+    use_https_pageserver_api: bool,
 }
 
 enum StrictMode {
@@ -321,6 +325,7 @@ async fn async_main() -> anyhow::Result<()> {
         address_for_peers: args.address_for_peers,
         start_as_candidate: args.start_as_candidate,
         http_service_port: args.listen.port() as i32,
+        use_https_pageserver_api: args.use_https_pageserver_api,
     };
 
     // Validate that we can connect to the database