Upgrade to SQLAlchemy 2.0

[smsearcy]

Upgrade to SQLAlchemy 2.0 and utilize the new API as much as possible.

• Test collection process
• Clean up Alembic migrations
• Use 2.0 select() statements everywhere

(Optimizing db updates will get its own branch)

[smsearcy]

Test failed, it looks like something is broken with the Node.links relationship. Not sure if that is causing the actual exception.

/home/smsearcy/Projects/mesh-info/meshinfo/collector.py:418: SAWarning: Multiple rows returned with uselist=False for lazily-loaded attribute 'Node.links'  (This warning originated from the Session 'autoflush' process, which was invoked automatically in response to a user-initiated operation.)
  .one_or_none()
Traceback (most recent call last):
  File "/home/smsearcy/Projects/mesh-info/.venv/bin/meshinfo", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/smsearcy/Projects/mesh-info/meshinfo/cli.py", line 82, in main
    collector.main(
  File "/home/smsearcy/Projects/mesh-info/meshinfo/collector.py", line 95, in main
    asyncio.run(service(collection, polling_period=config.period))
  File "/usr/lib64/python3.11/asyncio/runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/asyncio/base_events.py", line 654, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/smsearcy/Projects/mesh-info/meshinfo/collector.py", line 109, in service
    await collect()
  File "/home/smsearcy/Projects/mesh-info/meshinfo/collector.py", line 168, in collector
    link_models = save_links(links, dbsession, count=summary)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/smsearcy/Projects/mesh-info/meshinfo/collector.py", line 418, in save_links
    .one_or_none()
     ^^^^^^^^^^^^^
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/query.py", line 2754, in one_or_none
    return self._iter().one_or_none()  # type: ignore
           ^^^^^^^^^^^^
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/query.py", line 2827, in _iter
    result: Union[ScalarResult[_T], Result[_T]] = self.session.execute(
                                                  ^^^^^^^^^^^^^^^^^^^^^
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2351, in execute
    return self._execute_internal(
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2215, in _execute_internal
    ) = compile_state_cls.orm_pre_session_exec(
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/context.py", line 549, in orm_pre_session_exec
    session._autoflush()
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 3039, in _autoflush
    self.flush()
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 4341, in flush
    self._flush(objects)
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 4476, in _flush
    with util.safe_reraise():
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 146, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 4437, in _flush
    flush_context.execute()
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/unitofwork.py", line 466, in execute
    rec.execute(self)
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/unitofwork.py", line 591, in execute
    self.dependency_processor.process_saves(uow, states)
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/dependency.py", line 604, in process_saves
    self._synchronize(
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/dependency.py", line 625, in _synchronize
    sync.clear(dest, self.mapper, self.prop.synchronize_pairs)
  File "/home/smsearcy/Projects/mesh-info/.venv/lib64/python3.11/site-packages/sqlalchemy/orm/sync.py", line 88, in clear
    raise AssertionError(
AssertionError: Dependency rule on column 'node.node_id' tried to blank-out primary key column 'link.source_id' on instance '<Link at 0x7f4d8d8704d0>'