Add an object field name transformer to clean up results from RediSearch over JSON searches

When we perform a search over JSON document content, it would be nice to provide an extra object parameter describing how to name fields in the objects returned...

Example:

let results = await client.json.get('noderedis:jsondata', {
    path: ['.pets[1].name', '.pets[1].age']
});

might return:

{ '.pets[1].name': 'Rex', '.pets[1].age': 3 }

Proposing that something like this:

let results = await client.json.get('noderedis:jsondata', {
    path: ['.pets[1].name', '.pets[1].age'],
    responseMap: {
        '.pets[1].name': 'name',
        '.pets[1].age': 'age'
    }
});

would return:

{ 'name': 'Rex', 'age': 3 }

Start at the client.json.get entry point described in the issue and trace how JSON search paths become returned object keys. Add support for the proposed responseMap behavior, then verify that the example paths produce the keys name and age with their original values.