Schema errors for partytown.settings [#3567102]

Problem/Motivation

On Drupal 11, installing this module results in some missing schema errors at install time. Ideally, these should be remedied by fixing the schema meta data definition.

 [warning] Schema errors for partytown.settings with the following errors: partytown.settings:debug.enabled missing schema, partytown.settings:fallback_timeout missing schema. These errors mean there is configuration that does not comply with its schema. This is not a fatal error, but it is recommended to fix these issues. For more information on configuration schemas, check out <a href="https://www.drupal.org/docs/drupal-apis/configuration-api/configuration-schemametadata">the documentation</a>.

Steps to reproduce

Install partytown using the installation instructions on the info page.

Proposed resolution

Improve the schema definitions so that we have a more properly defined API.

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork partytown-3567102

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