Implement cipher key encryption (#3990)

migrations/mysql/2023-10-21-221242_add_cipher_key/down.sql

migrations/mysql/2023-10-21-221242_add_cipher_key/up.sql

...ions/postgresql/2023-10-21-221242_add_cipher_key/down.sql

...ations/postgresql/2023-10-21-221242_add_cipher_key/up.sql

migrations/sqlite/2023-10-21-221242_add_cipher_key/down.sql

migrations/sqlite/2023-10-21-221242_add_cipher_key/up.sql

src/api/core/ciphers.rs

src/api/core/mod.rs

src/db/models/cipher.rs

src/db/schemas/mysql/schema.rs

src/db/schemas/postgresql/schema.rs

src/db/schemas/sqlite/schema.rs