feature: Added support for user parameters in sync rules.

[Chriztiaan]

Description

This PR introduces the ability to pass parameters from a client SDK to the sync rules.
Parameters are available in the sync rules under user_parameters (only supported token_parameters until now). Client PR here

For example:

bucket_definitions:
  user_lists:
    parameters: select id as list_id from lists where owner_id = user_parameters.client_variable_test
    data:
      - SELECT * FROM lists where id = bucket.list_id

Testing

Verified values pull through via self-host project.

[stevensJourney]

LGTM