refs https://github.com/TryGhost/Product/issues/4123
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### <samp>🤖 Generated by Copilot at a420f0b</samp>
This pull request moves most of the API-related types and functions from
the `admin-x-settings` package to the `admin-x-framework` package, which
is a new library of common utilities and hooks for the admin-x apps. It
also adds some configuration files, such as `.eslintrc.cjs` and
`.gitignore`, to the `admin-x-framework` package. Additionally, it
exports the `FetchKoenigLexical` type from the `admin-x-design-system`
package, which is used by the `HtmlEditor` component.
