refactor(ext/tls): Implement required functionality for later SNI support (#23686)

Precursor to #23236 

This implements the SNI features, but uses private symbols to avoid
exposing the functionality at this time. Note that to properly test this
feature, we need to add a way for `connectTls` to specify a hostname.
This is something that should be pushed into that API at a later time as
well.

```ts
Deno.test(
  { permissions: { net: true, read: true } },
  async function listenResolver() {
    let sniRequests = [];
    const listener = Deno.listenTls({
      hostname: "localhost",
      port: 0,
      [resolverSymbol]: (sni: string) => {
        sniRequests.push(sni);
        return {
          cert,
          key,
        };
      },
    });

    {
      const conn = await Deno.connectTls({
        hostname: "localhost",
        [serverNameSymbol]: "server-1",
        port: listener.addr.port,
      });
      const [_handshake, serverConn] = await Promise.all([
        conn.handshake(),
        listener.accept(),
      ]);
      conn.close();
      serverConn.close();
    }

    {
      const conn = await Deno.connectTls({
        hostname: "localhost",
        [serverNameSymbol]: "server-2",
        port: listener.addr.port,
      });
      const [_handshake, serverConn] = await Promise.all([
        conn.handshake(),
        listener.accept(),
      ]);
      conn.close();
      serverConn.close();
    }

    assertEquals(sniRequests, ["server-1", "server-2"]);
    listener.close();
  },
);
```

---------

Signed-off-by: Matt Mastracci <matthew@mastracci.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/tests/integration/run_tests.rs b/tests/integration/run_tests.rs
index 88ddfb318..8a24603b3 100644
--- a/tests/integration/run_tests.rs
+++ b/tests/integration/run_tests.rs
@@ -13,6 +13,7 @@ use deno_core::serde_json::json;
 use deno_core::url;
 use deno_fetch::reqwest;
 use deno_tls::rustls;
+use deno_tls::rustls::ClientConnection;
 use deno_tls::rustls_pemfile;
 use deno_tls::TlsStream;
 use pretty_assertions::assert_eq;
@@ -5388,8 +5389,11 @@ async fn listen_tls_alpn() {
   let tcp_stream = tokio::net::TcpStream::connect("localhost:4504")
     .await
     .unwrap();
-  let mut tls_stream =
-    TlsStream::new_client_side(tcp_stream, cfg, hostname, None);
+  let mut tls_stream = TlsStream::new_client_side(
+    tcp_stream,
+    ClientConnection::new(cfg, hostname).unwrap(),
+    None,
+  );
 
   let handshake = tls_stream.handshake().await.unwrap();
 
@@ -5437,8 +5441,11 @@ async fn listen_tls_alpn_fail() {
   let tcp_stream = tokio::net::TcpStream::connect("localhost:4505")
     .await
     .unwrap();
-  let mut tls_stream =
-    TlsStream::new_client_side(tcp_stream, cfg, hostname, None);
+  let mut tls_stream = TlsStream::new_client_side(
+    tcp_stream,
+    ClientConnection::new(cfg, hostname).unwrap(),
+    None,
+  );
 
   tls_stream.handshake().await.unwrap_err();