Update object.js - Inline use of JSONparse patch

[34638a]

Add patch to allow for #JSONparse to be used as a inline helper.

*This is a feature parody patch to align use case with proposed change for JSONparseSafe helper. #341

Examples:
{{log (JSONparse '{"test":"variable"}')}}
{{log (lookup (JSONparse '{"test":{"validate":"variable"}}') "test")}}

What? Why?

To prevent this situation which makes code so much harder to maintain and reason with:

{{! Pretend at this layer there is a pagination object here }}

{{! Before}}
{{#JSONparse '{"test": "hello world!"}'}}
    {{#with this}}
        {{log test}}
        {{log ../../pagination}}
    {{/with}}
{{/JSONparse}}


{{! After}}
{{#with (JSONparse '{"test": "hello world!"}')}}
    {{log test}}
    {{log ../pagination}}
{{/with}}

This change removes a extra layer of context shifting ( ../ ) to access information about the context window.

How was it tested?

Local tests, modified local theme testing file.

cc @bigcommerce/storefront-team