nodetool: Implement [gs]etcompationthroughput commands

They exist in the original documentation, but are not yet implemented.
Now it's possible to do it.

Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>

test/nodetool/test_compaction_throughput.py

@@ -0,0 +1,19 @@
+#
+# Copyright 2024-present ScyllaDB
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+
+from test.nodetool.rest_api_mock import expected_request
+import pytest
+
+def test_get_compaction_throughput(nodetool, scylla_only):
+    res = nodetool("getcompactionthroughput", expected_requests = [
+            expected_request("GET", "/storage_service/compaction_throughput", response=0)
+        ])
+    assert res.stdout == '0\n'
+
+def test_set_compaction_throughput(nodetool, scylla_only):
+    nodetool("setcompactionthroughput", "100", expected_requests = [
+            expected_request("POST", "/storage_service/compaction_throughput", params={"value": "100"})
+        ])