change: Reorganize as griffe and griffelib packages with uv workspaces

[johnslavik]

I've started with this incomplete migration script (make sure to not have a dirty env, I personally run git clean -dxfe migrate.py -e .venv -e .venvs -e uv.lock && git reset --hard main): https://gist.github.com/johnslavik/76d556a427033c4de2d236d67aa05b8f

Will carry out the remaining details manually.

Closes #408

[johnslavik]

Left to do next:

• add pyproject.toml files to packages
• set up workspaces (almost got them working)
• set up dynamic versioning
• get test suite to work

[pawamoy]

Looks like there's an issue with the script, seeing the filesystem tree:

packages/griffe
└── src
    └── griffe
        └── griffe
            ├── __init__.py
            ├── _internal
            ├── __main__.py
            └── py.typed

Should be

packages/griffe
└── src
    └── griffe
        ├── __init__.py
        ├── _internal
        ├── __main__.py
        └── py.typed

And

packages/griffelib
└── packages
    └── griffelib
        └── packages
            └── griffelib
                └── src
                    └── griffelib
                        └── griffelib
                            ├── __init__.py
                            ├── _internal
                            └── py.typed

Should be

packages/griffelib
└── src
    └── griffelib
        ├── __init__.py
        ├── _internal
        └── py.typed

[johnslavik]

It's good now

[johnslavik]

Given how workspaces and packaging work, we'll do it a little different:

Put griffelib in the root (code under src/) and griffe in packages/griffe/.

[johnslavik]

New iteration:

• packages/griffelib/src/griffelib that implements the lib
• packages/griffe-cli/src/griffe_cli that implements cli and depends on griffelib
• src/griffe that reexports * and __all__s from griffe_cli and griffelib and depends on griffe-cli and griffelib

Libraries that implement fancy things will do their stuff scoped to their directories.

In short:
3 packages

• griffe -- remains our public API, depends on griffecli and griffelib, re-exports symbols (and packaging extras) from both griffecli and griffelib
• griffecli -- implements the CLI only, depends on griffecli
• griffelib -- implements the library only, depends on nothing

all three will be released with identical version numbers