[Feature Request] Spring Feature Flags from Multiple Stores #497

Original from: #358

Because of the format of Feature Flag configuration, loading feature flags from multiple store results in only the last store loaded i.e. store[0], or the highest priority store with feature flags.

When loading multiple stores feature flags should be merged with last store having priority.

i.e.
I have Stores A and B, where A is priority:
Store A has
Alpha = true
Beta = false

Store B has
Beta = true
Gama = true

Feature Management would return
Alpha = true
Beta = false
Gama = true