Allow passing modules to Tortoise.init_models()

[lqmanh]

Description

Allow passing module objects to models_paths param of Tortoise.init_models().

Motivation and Context

Now Tortoise.init_models() only accepts models_paths as a list of strings, which may cause ConfigurationError(f'Module "{models_path}" not found') later.
With this PR, passing module objects directly instead of their paths can prevent those potential errors. Most editors/IDEs will alert developers immediatelly if there is something wrong.

Example:

Instead of:

from tortoise import Tortoise

async def main():
    await Tortoise.init(
        db_url='sqlite://db.sqlite3',
        models={'models': ['app.models']}
    )

...

Do this:

from tortoise import Tortoise
import app.models

async def main():
    await Tortoise.init(
        db_url='sqlite://db.sqlite3',
        models={'models': [app.models]}
    )

...

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[coveralls]

Pull Request Test Coverage Report for Build 380879510

• 10 of 11 (90.91%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 96.336%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tortoise/init.py	10	11	90.91%

Totals
Change from base Build 375755212:	-0.03%
Covered Lines:	4270
Relevant Lines:	4380

---

💛 - Coveralls

[abondar]

Thanks you! Looks good to me

Could you please add description to the top of changelog file?

[lqmanh]

@abondar I've updated the changelog and added myself to contributor list.

[abondar]

@lqmanh released as 0.16.19

[bnaoki]

Hello, should the types have been updated for init() and generate_config() as well? Same with register_tortoise in tortoise.contrib.fastapi.

[lqmanh]

@bnaoki No I hadn't updated those functions. I'll create another PR when I have time.

[lqmanh]

Hey @bnaoki,
Seems like @long2ice has already helped. Many thanks!