Introduce Shard IDs to logically group nodes in cluster mode (#10536)

Introduce Shard IDs to logically group nodes in cluster mode.
1. Added a new "shard_id" field to "cluster nodes" output and nodes.conf after "hostname"
2. Added a new PING extension to propagate "shard_id"
3. Handled upgrade from pre-7.2 releases automatically
4. Refactored PING extension assembling/parsing logic

Behavior of Shard IDs:

Replicas will always follow the shards of their reported primaries. If a primary updates its shard ID, the replica will follow. (This need not follow for cluster v2) This is not an expected use case.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/commands/cluster-myshardid.json b/src/commands/cluster-myshardid.json
new file mode 100644
index 000000000..ffd26eec6
--- /dev/null
+++ b/src/commands/cluster-myshardid.json
@@ -0,0 +1,18 @@
+{
+    "MYSHARDID": {
+        "summary": "Return the node shard id",
+        "complexity": "O(1)",
+        "group": "cluster",
+        "since": "7.2.0",
+        "arity": 2,
+        "container": "CLUSTER",
+        "function": "clusterCommand",
+        "history": [],
+        "command_flags": [
+            "STALE"
+        ],
+        "command_tips": [
+            "NONDETERMINISTIC_OUTPUT"
+        ]
+    }
+}