Backport 2.2 Set cache id prefix on installation

[Ctucker9233]

Original pull request #18641

Description (*)

The undocumented id_prefix option for the cache frontend is used to prefix cache keys. If it is not set, Magento uses the first 12 bits of the md5 hash of the absolute path to Magentos app/etc directory. But if this is not exactly the same on all web servers, cache invalidation does not work.

Source: https://github.com/magento/magento2/blob/2.3-develop/lib/internal/Magento/Framework/App/Cache/Frontend/Factory.php#L121-L130

To prevent this issue, the value shall be set on installation, so that the fall back on the fly does not happen anymore. Optionally, the value can be specified explicitly.

Fixed Issues (if relevant)

#15828: Multisite installation, default website slow

Manual testing scenarios (*)

1. Install Magento via CLI or Web Wizard
2. There should be new options "cache-id-prefix" and "page-cache-id-prefix"
3. The value is saved in env.php at cache/frontend/{default,page_cache}/id_prefix

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[m2-assistant]

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