Support json.toggle and json.clear commands

[oshadmi]

Add support for the following commands:
json.toggle
json.clear

[k-shrey]

What do these commands do? Can you provide a link detailing them? Can't seem to find them here https://oss.redislabs.com/redisjson/commands/

[oshadmi]

Please see this comment

[Shivam010]

Thanks @oshadmi for the information.

I tried the commands and reviewed the provided test cases of (toggle, clear).

Correct me if I am wrong or I missed something, the specification of both of them is similar to that of json.del.

Syntax
JSON.CLEAR <key> [path]
JSON.TOGGLE <key> [path]

And json.clear returns 1 or 0 and error similar to that of json.del while json.toggle returns corresponding boolean value and error.

[Shivam010]

@oshadmi Feel free to submit a PR, I would be happy to review the changes.