[Refactor] Update database schema for series cast

[Divinelink]

Summary

This pull request essentially updates the database schema for series cast information.

The initial implementation was not scalable and it made it impossible to add cast information for other credit types like season guest stars, episode guest stars etc without adding multiple tables with redundant information. This would create performance and storage issues.

We updated the related schema in order to store basic person information and person roles in separate tables.

CREATE TABLE PersonEntity(
  id INTEGER PRIMARY KEY NOT NULL,
  name TEXT NOT NULL,
  originalName TEXT NOT NULL,
  profilePath TEXT,
  knownForDepartment TEXT,
  gender INTEGER NOT NULL
);

CREATE TABLE PersonRoleEntity(
  creditId TEXT PRIMARY KEY NOT NULL,
  character TEXT NOT NULL,
  castId INTEGER NOT NULL REFERENCES PersonEntity(id)
);

CREATE TABLE ShowCastRoleEntity(
  showId INTEGER NOT NULL,
  creditId TEXT NOT NULL REFERENCES PersonRoleEntity(creditId),
  episodeCount INTEGER NOT NULL,
  creditOrder INTEGER NOT NULL,
  PRIMARY KEY (showId, creditId)
);

With this change, person and role data stored once and referenced while it's easy to add new credit types by creating new association tables.

[codecov]

Codecov Report

❌ Patch coverage is 97.26027% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.30%. Comparing base (175a268) to head (d37e858).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...ata/details/mapper/AggregateCreditsEntityMapper.kt	85.71%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
- Coverage   79.33%   79.30%   -0.04%     
==========================================
  Files         721      717       -4     
  Lines       19702    19678      -24     
  Branches     2187     2187              
==========================================
- Hits        15631    15605      -26     
- Misses       3142     3143       +1     
- Partials      929      930       +1     

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