Allow JWT/RBAC write access with payload filters, link to access table

[timvisee]

The JWT/RBAC access settings dialog currently greys out the 'Payload Filters' section if write operations are checked.

Payload filters are supported when write access is enabled, and so it should not be greyed out when write access is selected.

To help clarify this, we might want to add a [Access table] link in the dialog.

[generall]

Write operation support is quite limited and might be confusing if applied without checking on the documentation. I would prefer to keep it as-is for now

[timvisee]

The problem is this: if you disable write operations, you can edit the payload filters. If you then enable writes again, these filters stay. It feels like a hack and makes it only more confusing.

I think we should choose one of:

1. allow payload filters with write operations
2. if enabling write operations, clear and grey out the payload filters