Add new operation: Template

[kendallgoto]

Templating engines are typically used to e.g. populate webpages while rendering given some backing object, however templates in general can be useful for creating quick breakdowns of JSON objects. In this operation, Handlebars is used to perform templating in order to provide an effective interface for converting JSON input to some formatted output. Functionally, existing recipes like Jq can provide similar functionality, but with a much less comprehendible interface.

Compare the following samples:

Using Template operation

Using existing operations (such as Jq)