fix: signal.pause is not available on Windows (#5618)

- Just use the `KeyboardInterrupt` to determine when to exist
- Simplifies the logic for both Windows and Unix based systems
- Seems to have no other side effects
- Also add `@Deprecated` annotation to the EmbeddedServer method that was marked as deprecated, get rid of a build warning

py/embedded-server/deephaven_server/cli.py

@@ -53,9 +53,10 @@ def server(host, port, jvm_args, extra_classpath, default_jvm_args):
     )
     click.echo("Press Control-C to exit")
 
-    def signal_handler(sig, frame):
+    try:
+        while True:
+            input()
+    except KeyboardInterrupt:
+        # signal_handler should already be called
         click.echo("Exiting Deephaven...")
-        sys.exit(0)
-
-    signal.signal(signal.SIGINT, signal_handler)
-    signal.pause()
+        sys.exit(0)

py/embedded-server/java-runtime/src/main/java/io/deephaven/python/server/EmbeddedServer.java

@@ -99,6 +99,7 @@ interface Builder extends JettyServerComponent.Builder<Builder, PythonServerComp
      *
      * @deprecated use {@link #EmbeddedServer(String, Integer)} instead. dict is not used.
      */
+    @Deprecated
     public EmbeddedServer(String host, Integer port, PyObject dict) throws IOException {
         this(host, port);
     }