feat(internal): add flag/segment override layer, overlay store, and change notification diff - #408

feat(internal): add flag/segment override layer, overlay store, and change notification diff#408

kinyoklion wants to merge 3 commits into

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rlamb/sdk-2655/internal-overrideslaunchdarkly/go-server-sdk:rlamb/sdk-2655/internal-overridesCopy head branch name to clipboard