feat: Implement person and tag management services

- Added `Person` and `Tag` models to the core library.
- Created `PersonService` and `TagService` traits with implementations for managing persons and tags.
- Introduced repositories for `Person`, `Tag`, `FaceRegion`, and `PersonShare` with PostgreSQL support.
- Updated authorization logic to include permissions for accessing and editing persons.
- Enhanced the schema to support new models and relationships.
- Implemented database migrations for new tables related to persons and tags.
- Added request and response structures for API interactions with persons and tags.

libertas_api/migrations/20251115093642_create_people_shares_table.sql

@@ -0,0 +1,13 @@
+CREATE TYPE person_permission AS ENUM (
+    'view',
+    'can_use'
+);
+
+CREATE TABLE person_shares (
+    person_id UUID NOT NULL REFERENCES people (id) ON DELETE CASCADE,
+    user_id UUID NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+    permission person_permission NOT NULL,
+    PRIMARY KEY (person_id, user_id)
+);
+
+CREATE INDEX idx_person_shares_user_id ON person_shares (user_id);