Add knot.toml schema

[MichaReiser]

TODO:

• A test asserting that the JSON schema is up to date
• Some documentation explaining the limitation that it always uses the default registry and how this limitation could be lifted (if we wanted to)
• A test plan using VS code in JSON (Even better toml doesn't play nicely :( )

Inline Schema notation

#:schema /Users/micha/astral/ruff/knot.schema.json


[environment]
extra-paths = []


[rules]
call-possibly-unbound-method = "error"
unknown-rule = "error"

# duplicate-base = "error"

{
    "$schema": "file:///Users/micha/astral/ruff/knot.schema.json",

    "environment": {
        "python-version": "3.13",
        "python-platform": "linux2"
    },

    "rules": {
        "unknown-rule": "error"
    }
}

[github-actions]

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