Add support for more keys in the template

[sardanaaman]

As of right now, AutoDoc supports templating just the name and description of the workflow. Could we allow workflow developers to use any key available in the workflow JSON as part of their template?

For example, some developers may want to dynamically generate names & descriptions of all input variables. Input variables are identified by the scope attribute under variables > properties in a workflow JSON, and name & description are also available as keys at that level. There may be other use-cases to include targets, is_atomic etc. in the template.

This will be a useful capability to have!