Improve Drupal 10 compatibility and stability fixes.

[omkar-pd](https://www.drupal.org/u/omkar-pd), [Vighneshh](https://www.drupal.org/u/vighneshh), [nevergone](https://www.drupal.org/u/nevergone), [mehul.gada](https://www.drupal.org/u/mehul.gada), [singularo](https://www.drupal.org/u/singularo), [anoopsingh92](https://www.drupal.org/u/anoopsingh92), [mrinalini9](https://www.drupal.org/u/mrinalini9), [Rakhi Soni](https://www.drupal.org/u/rakhi-soni), [dipesh_goswami](https://www.drupal.org/u/dipesh_goswami), [nitin_lama](https://www.drupal.org/u/nitin_lama), [atul ghate](https://www.drupal.org/u/atul-ghate)

**Issues**: 8 issues resolved.

Changes since [8.x-1.2](https://www.drupal.org/project/redirect_after_logout/releases/8.x-1.2):

* [#3302131](https://www.drupal.org/node/3302131) by [mehul.gada](https://www.drupal.org/u/mehul.gada), [nevergone](https://www.drupal.org/u/nevergone): Logout message line-break
* [#3303794](https://www.drupal.org/node/3303794) by [nevergone](https://www.drupal.org/u/nevergone): Support website with subdirectory
* [#3301680](https://www.drupal.org/node/3301680) by [nevergone](https://www.drupal.org/u/nevergone): Better internal and valid path detection
* [#3301672](https://www.drupal.org/node/3301672): Redirect message not show, if page is cached before

* [#3302137](https://www.drupal.org/node/3302137) by [omkar-pd](https://www.drupal.org/u/omkar-pd), [Vighneshh](https://www.drupal.org/u/vighneshh), [nevergone](https://www.drupal.org/u/nevergone): Logout message type
* [#3298837](https://www.drupal.org/node/3298837) by [nevergone](https://www.drupal.org/u/nevergone): Improve form settings management.
* [#3229727](https://www.drupal.org/node/3229727) by [singularo](https://www.drupal.org/u/singularo), [nevergone](https://www.drupal.org/u/nevergone): Masquerade is interfered with by redirection

* [#3293261](https://www.drupal.org/node/3293261) by [anoopsingh92](https://www.drupal.org/u/anoopsingh92), [mrinalini9](https://www.drupal.org/u/mrinalini9), [Rakhi Soni](https://www.drupal.org/u/rakhi-soni), [dipesh_goswami](https://www.drupal.org/u/dipesh_goswami), [nitin_lama](https://www.drupal.org/u/nitin_lama), [atul ghate](https://www.drupal.org/u/atul-ghate), [nevergone](https://www.drupal.org/u/nevergone): Drupal Coding Standard Issue As per 'phpcs --standard=Drupal'

First Drupal 10.x compatible release.

- Issue #3199061 by vipin.mittal18: License "GPL-2.0+" is a deprecated SPDX license identifier
- Issue #3266648: remove deprecated codes
- Issue #3266708: Remove unneccesary permission
- Add initial configuration schema and code cleanup
- Issue #3266700: Add test coverage
- Check redirect to external website
- Issue #3266700: test format with assertSession() method
- Issue #3266700: Unnecessary token test in settings form
- Issue #3203379: Token paths are invalid
- Issue #3289275: Drupal 10 compatibility

Drupal 9 compatible release.

- Configuration schema refactored (update hook added).
- frontpage destination fix