Fluid compilation is disabled for templates with switch ViewHelpers

[neos-bot]

Jira issue originally created by user @bwaidelich:

Since https://forge.typo3.org/issues/28544 Fluid compiles templates into PHP when they are parsed for the first time.
But this compilation is disabled if a ViewHelper is used, that:

• implements ChildNodeAccessInterface and
• does not implement CompilableInterface

This is the case for the SwitchViewHelper.
We should implement the CompilableInterface in a similar fashion to how AbstractConditionViewHelper solves that.

See https://forge.typo3.org/issues/64449 for the original report (in the TYPO3 CMS bugtracker)

Jira-URL: https://jira.neos.io/browse/FLOW-224

[neos-bot]

Comment created by @bwaidelich:

FYI: I tried to implement that but it's more complex than for the AbstractConditionViewHelper because of the CaseViewHelpers having to evaluate the expression..