feat: add plugin meta and support typescript-eslint@7

[JoshuaKGoldberg]

Adds @typescript-eslint/utils@7 as an allowed version, as both 6 and 7 work with this package.

Adds a meta per https://eslint.org/docs/latest/extend/plugin-migration-flat-config#adding-plugin-meta-information as a non-breaking change. Adding in the meta actually fixes #85, since this plugin doesn't expose any preset config anyway.

Also swaps from the long-inactive tsutils to its successor, ts-api-utils. That's what @typescript-eslint/* packages use.