GET /role-bindings

To support drawers in "My Access" views [here|https://www.figma.com/design/2prc9oMdxOmZbERUdDinFs/Workspaces---Post-MVP?node-id=4123-16595&p=f&t=WfAH2hZWwwH50NDD-0,] we need to update the existing List Rolebinding API to also allow filtering by Subject (so subject_id and subject_type) and Resource ( so resource_type and resource_id).

Acceptance criteria:

• Update spec to add filters
• Implement functionality
• Get reviewed by leads/architect