Feature gate

[travon-speller]

Description

Adds a few new table for a Feature Gate system. You can select an app or base Semoss and then create a feature flag with versions. Then you can add users to the different versions. In your FE code can use either CheckFeatureFlag or GetUserFeatureFlag to determine to show/hide app features to certain users. This will help with not having to make diff applications that are slightly different.

Changes Made

Added a CRUD reactors to handle feature gate. added a few more for fetching if user is eligible

How to Test

1. Call the reactors to create a feature
2. Call reactor to create new versionBucket for the feature and then add user to new bucket
3. Call the CheckFeatureFlag reactor to see its results. Use GetUserFeatureFlag if you want more detailed results

Notes

FE PR SEMOSS/semoss-ui#3342

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