[JS] Add parameter suggestion on Ctrl + P

### Description

Currently, the JS editor does not show the tooltip of possible parameters when pressing Ctrl + p while the cursor is within e.g.:
window.atob(|cursor here|);

I suggest to add the parameter tooltip as in e.g. the PHP editor.

### Use case/motivation

_No response_

### Related issues

_No response_

### Are you willing to submit a pull request?

No

Start in the JavaScript editor's handling of Ctrl+P and compare it with the PHP editor's parameter tooltip behavior. Trace how the example window.atob() call is handled when the cursor is inside its parentheses. Done means pressing Ctrl+P in JavaScript shows the available parameter tooltip consistently with PHP.

Written by the indexing model from the issue text.