why doesn't the 'test' condition go through LanguageSupport?

[rrayst]

@predic8 why doesn't the 'test' condition go through LanguageSupport?

All Spel Expressions (as currently implemented in the master branch and suggested by this pull request) are always interpreted.

Adding these expressions to a rule key causes a slow down in all incoming requests.

Allowing the user to switch to Groovy would therefore increase performance significantly.

Originally posted by @rrayst in #1185 (comment)

[t-burch]

@rrayst we should enable the SpEL compiler, which increases the performance massively
We want to use the SpEL evaluation context that is used in many places in Membrane now, as the primary expression engine

[predic8]

Use SpEL compiler