[TECHNICAL] OCS sharing and space members refactor

With the new implementation for OCIS shares listing (https://github.com/owncloud/android/issues/4876), it's necessary to refactor all classes and methods related to the legacy sharing implementation to keep the codebase consistent.

OCS implementation → Use the Ocs prefix.
Graph API implementation → Use the Graph prefix (already done) ✅

Moreover, an additional check is needed in the XML files used for space members and shares to ensure that the ids are generic and consistent.

TODOs

• Refactor OCS classes adding the Ocs prefix
• Refactor XML files used for space members and shares
• Move the adapter and the recycler view setup for roles in AddMemberFragment to onViewCreated method
• Add a delay to the members search to avoid repetitive requests when user types quickly
• Use extension functions to bind roles, date picker and other UI elements
• Refactor the members filter to match the implementation in AddGraphShareFragment

TASKS

• Research (if needed)
• Create branch technical/ocs_sharing_refactor
• Development tasks
  • Implement whatever
  • ...
  • Implement unit tests (if needed)
• Code review and apply changes requested
• Design test plan
• QA
• Merge branch technical/ocs_sharing_refactor into master

Start by comparing the legacy OCS sharing classes with the implementation from issue 4876 and the already-prefixed Graph API classes. Inspect AddMemberFragment, AddGraphShareFragment, and the XML files used for space members and shares, including their adapters, filters, and role setup. Done means the OCS prefixes, generic XML ids, delayed search, extension-function bindings, and matching member-filter behavior are implemented and verified through the planned tests and QA.