Allow full request/response to be accessible from Convert Workflow

[rew1nter]

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Description

The Query To JSON workflow is a good example of why this is needed. This plugin can use the full request access feature to parse and convert the queries to json and vice versa without having the user select the query/body every time.

Instead a user can just right click and call convert on the whole request

Use cases

Save user the work of selection for certain plugins :)

[Sytten]

We will need to figure out how to merge the nodes of passive/active with convert.
I think we can't do it before we make the input data types more obvious.
We also need a separate start node for convert that has a the request/response.
Finally we need a way to output new datatypes, not only bytes.