ConfigInspectorItemForm::buildFormConfigElement() should use a type hierarchy instead of hardcoding form items for types

Problem/Motivation

Discovered while making tests run on Drupal 10.2 over at #3396042: Adopt GitLab CI.

Drupal 10.2 added:

1. type: langcode
2. type: machine_name
3. type: required_label

Consequently, the hardcoded logic in \Drupal\config_inspector\Form\ConfigInspectorItemForm::buildFormConfigElement() that only supports a dozen or so types no longer works. And it has never worked for contrib-defined types.

Steps to reproduce

Use Config Inspector 2.1.5 on Drupal 10.2.x.

Proposed resolution

1. Use a type hierarchy to determine appropriate form elements: required_label extends label which extends string.
2. Bonus points: when installed, use Content Translation's config_translation_config_schema_info_alter() hardcoded improvements.

Remaining tasks

User interface changes

API changes

Data model changes