feat: add new_with_table() initializer for ring-buffers and removal of RegisterUpdaters

- It is now possible to pass a linked-list table to the ring-buffer with
the `new_with_table()` function or use the `new()` function for a basic
ring-buffer setup.
- A `simple_ring_buffer_table()` function was added to the read and
write ring-buffers to generate the same table as the one created by
`new()` in case the user only wants to customize the default table
options.
- RegisterUpdaters have been removed as the user now has direct access
to the table and its items if needed.

See: https://github.com/elagil/embassy/pull/1#issuecomment-2891997294

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