Migrate lint/format tool from isort/black to ruff and run unittest of examples in ci

[waketzheng]

1. Fully migrate to Ruff, remove black, use ruff format to make style;
2. Auto run unittests in examples when running ci

Description

Ruff is much more faster, we can fully migrate to it as the fastapi's lint script

Motivation and Context

1. Unittests in examples should also be run in ci
2. Lint/format by only ruff is better than by isort+black+ruff.

How Has This Been Tested?

make ci

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 added the changelog 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 8889506316

Details

• 4 of 5 (80.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.005%) to 87.929%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tortoise/contrib/mysql/fields.py	0	1	0.0%

Totals
Change from base Build 8879569614:	-0.005%
Covered Lines:	5768
Relevant Lines:	6464

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💛 - Coveralls