Feat: Remove need to import CacheConfig classes in addition to the Cache class

[aaronsteers]

This refactor streamlines cache creation by cutting in half the number of imports the user needs to deal with.

Instead of:

from airbyte.caches import SnowflakeCache, SnowflakeCacheConfig

cache = SnowflakeCache(
    SnowflakeCacheConfig(
        account=secret["account"],
        username=secret["username"],
        password=secret["password"],
        database=secret["database"],
        warehouse=secret["warehouse"],
        role=secret["role"],
    )
)

The user could just do this:

from airbyte.caches import SnowflakeCache

cache = SnowflakeCache(
    account=secret["account"],
    username=secret["username"],
    password=secret["password"],
    database=secret["database"],
    warehouse=secret["warehouse"],
    role=secret["role"],
)