[Task]: HTTP review

### What needs to happen?

Following https://github.com/apache/hop/issues/3407#issuecomment-1816393414 , this task aims to collect all requirements around http transformers in order to make an actionable development.

@hansva , should http action be taken into account?

### Issue Priority

Priority: 3

### Issue Component

Component: Transforms

Start by reading issue 3407 and the linked comment that prompted this task. Inventory the requirements for HTTP transformers and determine whether the HTTP action is also in scope; document a decision and an actionable development scope as the definition of done.

Written by the indexing model from the issue text.