Add simplesettings to Easy Nextcloud

[thlehmann-ionos]

Resolves: INTERNAL-6776

Summary

1. Simplesettings was added
2. It requires a the "redirects" config, which allows configuring redirects from paths to routes

Simplesettings

Small subset of the settings a user can make

Redirect config

Example config

"redirects" => { "^/path/regexp" => "an.apps.controller.route.locator" }

Use case

• An administrator can configure another app as target for certain paths.

Differentiation from Apache redirects

• this allows configuring redirects in one place and avoids spreading
  the configuration in multiple places.
• the target route locator is more expressive/easier to trace than a
  path

Checklist

• Code is properly formatted ✔️
• Sign-off message is added to all commits ✔️
• Tests (unit, integration, api and/or acceptance) are included ⏳
• Screenshots before/after for front-end changes (not applicable)
• Documentation (manuals or wiki) has been updated or is not required (not for our fork)
• Backports requested where applicable (ex: critical bugfixes) (not for our fork)

[github-actions]

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[printminion-co]

• review ok with requested changes
• unfortunately we have no php unitests :( (do not see any tests for base.php)