Add NOVALUES support to HSCAN

[rueian]

Ref: redis/go-redis#2919

Suggested change:

Add a NOVALUES block to the end of:

rueidis/hack/cmds/commands.json

Lines 2993 to 3016 in 236216b

	"HSCAN": {
	"summary": "Incrementally iterate hash fields and associated values",
	"complexity": "O(1) for every call. O(N) for a complete iteration, including enough command calls for the cursor to return back to 0. N is the number of elements inside the collection..",
	"arguments": [
	{
	"name": "key",
	"type": "key"
	},
	{
	"name": "cursor",
	"type": "unsigned integer"
	},
	{
	"command": "MATCH",
	"name": "pattern",
	"type": "pattern",
	"optional": true
	},
	{
	"command": "COUNT",
	"name": "count",
	"type": "integer",
	"optional": true
	}

and then run go generate

---

The NOVALUES block should look like:

      {
        "name": "NOVALUES",
        "type": "pure-token",
        "token": "NOVALUES",
        "optional": true
      }