Adopt `eslint-import-context` for correct rule context with `cwd`

https://github.com/un-ts/eslint-import-context

Usage:

```ts
const context = useRuleContext()
const cwd = context?.cwd || process.cwd() // fallback to previous behavior when `context.cwd` unavailable for `eslint-plugin-import` and old `eslint-plugin-import-x` versions
```