unleash-client-php!1

This merge request includes all the work to date, complete with a psr compliant caching interface.

We want to make it Unleash compliant, but for our purposes we can focus on the gitlab version

https://docs.gitlab.com/ee/user/project/operations/feature_flags.html

Specifically, we need to implement the strategies section

https://docs.gitlab.com/ee/user/project/operations/feature_flags.html#feature-flag-strategies

changed milestone to %Unleash feature toggles

added scoped labels

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changed the description

unassigned @brianhatchet

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Hijacking this one as the remainder of the work to be done card.

assigned to @edgebal

added scoped label

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changed title from C to C

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changed weight to 10

changed time estimate to 1d 2h