Adding support for sqlalchemy 2.x

[JPchico]

Due to the changes on how MetaData work in sqlalchemy-2.x one needs to modify the functions to create the diagrams to make sure that the engine information is passed.

The github workflows have also been updated so that up to date actions are used.

The package installation has been moved to pyproject.toml to make it work with flit building tool.

A pre-commit-config.yaml file was also added to ensure that code formatting is more easily maintained.

[naturedamends]

Working for me

pip install git+https://github.com/JPchico/[email protected]

confirmed with

    @app.cli.command("erd")
    @click.argument("file_name")
    def create_erd(file_name):
        from sqlalchemy_schemadisplay import create_schema_graph
        graph = create_schema_graph(
            engine=db.engine,
            metadata=db.metadata,
            show_datatypes=False, # The image would get nasty big if we'd show the datatypes
            show_indexes=False, # ditto for indexes
            rankdir='LR', # From left to right (instead of top to bottom)
            concentrate=False # Don't try to join the relation lines together
        )
        graph.write_png(file_name) # write out the file

[Zlopez]

This PR looks like a complete rewrite to me, but I like how it looks. If the tests are passing I don't see any reason to not merge it.

[Zlopez]

All the tests are passing (tested locally), I'm for merging this one. @RagingRoosevelt What do you think?

[abitrolly]

That's a huge commit. :D @Zlopez I just hope you gave it a good security review.

[Zlopez]

@abitrolly I spend a whole day looking at it. It actually doesn't change much, just makes it better structured.

[abitrolly]

Awesome. Because I am bankrupt on Open Source code reviews. :D

For me having a single file dependency was easier to vendor in https://github.com/abitrolly/sqlite2png/