fix: Expose TableSubscription.close() to JS (#6446) (#6448)

- The close() method is only on `AbstractTableSubscription`, and it
appears that it doesn't automatically get added to the JS API even
though `TableSubscription` is defined as a `JsType`
- Explicitly add the method to `TableSubscription` as well.
- Fixes #6447

---------

Co-authored-by: Colin Alworth <[email protected]>

web/client-api/src/main/java/io/deephaven/web/client/api/subscription/AbstractTableSubscription.java

@@ -29,6 +29,7 @@
 import io.deephaven.web.shared.data.RangeSet;
 import io.deephaven.web.shared.data.ShiftedRange;
 import io.deephaven.web.shared.fu.JsRunnable;
+import jsinterop.annotations.JsMethod;
 import jsinterop.annotations.JsProperty;
 import jsinterop.base.Any;
 import jsinterop.base.Js;
@@ -51,6 +52,7 @@
  * exposed to api consumers, rather than wrapping in a Table type, as it handles the barrage stream and provides events
  * that client code can listen to.
  */
+@TsIgnore
 public abstract class AbstractTableSubscription extends HasEventHandling {
     /**
      * Indicates that some new data is available on the client, either an initial snapshot or a delta update. The
@@ -534,6 +536,7 @@ public JsArray<Column> getColumns() {
     /**
      * Stops the subscription on the server.
      */
+    @JsMethod
     public void close() {
         state.unretain(this);
         if (doExchange != null) {