Enhancement for FastAPI lifespan support (#1371)

[waketzheng]

Description

Separate register_tortoise to RegisterTortoise.init and RegisterTortoise.close function

Motivation and Context

Support fastapi's lifespan and compare old register format

How Has This Been Tested?

• make style
• make test_sqlite
• cd examples/fastapi && pytest _tests.py

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 5798325204

• 0 of 25 (0.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 88.733%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tortoise/contrib/fastapi/init.py	0	25	0.0%

Files with Coverage Reduction	New Missed Lines	%
tortoise/contrib/fastapi/init.py	2	0%

Totals
Change from base Build 5645776199:	-0.2%
Covered Lines:	5744
Relevant Lines:	6401

---

💛 - Coveralls

[long2ice]

I feel that this PR is not much different from before the change. What about just adding the corresponding warning and updating the example and docs?

[waketzheng]

Warning added, example and docs updated.

[waketzheng]

@long2ice take a look at this, register_tortoise for fastapi compare with old version and support lifespan now.

[waketzheng]

@long2ice How to fix this unittest error:

Diff is 65175 characters long. Set self.maxDiff to None to see it. : Ellipsis
------------------------------ Captured log call -------------------------------
WARNING  asyncio:base_events.py:1904 Executing <Task pending name='Task-4589' coro=<IsolatedAsyncioTestCase._asyncioLoopRunner() running at /opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/unittest/async_case.py:95> wait_for=<Future pending cb=[Task.task_wakeup()] created at /opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/asyncio/base_events.py:429> created at /home/runner/work/tortoise-orm/tortoise-orm/tortoise/contrib/test/__init__.py:190> took 1562.231 seconds
=========================== short test summary info ============================
FAILED tests/test_bulk.py::TestBulk::test_bulk_create_mix_specified - AssertionError: Lists differ: [{'id': 2028, 'name': None}, {'id': 2029, 'name':[27970 chars]one}] != [{'id': 10000, 'name': None}, {'id': 10001, 'name[28946 chars]one}]

First differing element 0:
{'id': 2028, 'name': None}
{'id': 10000, 'name': None}

Diff is 65175 characters long. Set self.maxDiff to None to see it. : Ellipsis
1 failed, 1071 passed, 59 skipped, 3 xfailed in 1623.54s (0:27:03)
make: *** [Makefile:53: test_postgres_psycopg] Error 1

[waketzheng]

ci failed, but my local test success. Move it to #1541