Add support for JSON.MSET (#2605)

* Added MSET command

MSET command added. Requires all keys to have the same JSON Path, which might fit most use cases, but is a limitation.  Optionally we could make the path an array as well to support all use cases.

* change JSON.MSET signature, add to json command object, fix tests

* its `item.value`, not `item.json`..

* Update MSET.ts

Removed unused RedisCommandArguments

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Co-authored-by: Leibale Eidelman <me@leibale.com>

packages/json/lib/commands/index.ts

@@ -9,6 +9,7 @@ import * as DEL from './DEL';
 import * as FORGET from './FORGET';
 import * as GET from './GET';
 import * as MGET from './MGET';
+import * as MSET from './MSET';
 import * as NUMINCRBY from './NUMINCRBY';
 import * as NUMMULTBY from './NUMMULTBY';
 import * as OBJKEYS from './OBJKEYS';
@@ -42,6 +43,8 @@ export default {
     get: GET,
     MGET,
     mGet: MGET,
+    MSET,
+    mSet: MSET,
     NUMINCRBY,
     numIncrBy: NUMINCRBY,
     NUMMULTBY,