feat(analytics): Implement semver and date custom ops for flags runtime props

[efahk]

Adds Semantic Versioning and RFC3339 date comparison support for feature flags runtime event matching. This implements them as extensions to the JSONLogic library that is being used for targeting.

See here for more information about the comparators and golden vector list

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the previously reported duplicate test artifact is absent from the current tree.

Important Files Changed

Filename	Overview
src/main/java/com/mixpanel/mixpanelapi/featureflags/util/CustomOperators.java	Implements validated SemVer and RFC3339 datetime comparisons.
src/main/java/com/mixpanel/mixpanelapi/featureflags/util/JsonLogicEngine.java	Registers the new operators during JSON Logic engine initialization.
src/test/java/com/mixpanel/mixpanelapi/featureflags/util/CustomOperatorsTest.java	Executes both golden-vector suites through the production evaluation path.

_{Reviews (3): Last reviewed commit: "hand roll semver and update tests" | Re-trigger Greptile}