feat: add get_user_role_assignments_per_scope_type api function

[BryanttV]

Description

Adds get_user_role_assignments_per_scope_type, a user-scoped helper to fetch role assignments filtered by ScopeData subclass. This mirrors the existing get_all_role_assignments_per_scope_type in roles.py, but for a single user.

Usage

from openedx_authz.api.data import CourseOverviewData, OrgCourseOverviewGlobData
from openedx_authz.api.users import get_user_role_assignments_per_scope_type

assignments = get_user_role_assignments_per_scope_type(
    user_external_key=user.username,
    scope_types=(CourseOverviewData, OrgCourseOverviewGlobData),
)

Merge checklist

Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

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[mariajgrimaldi]

LGTM. Thanks a lot!