feat(analytics): Implement semver and date custom operators for flags runtime events

[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 or 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.

Important Files Changed

Filename	Overview
analytics/src/main/java/com/mixpanel/android/mpmetrics/CustomOperators.java	Implements both custom comparisons and now strictly rejects the previously reported malformed dates, invalid offsets, and oversized datetime targets.
analytics/src/main/java/com/mixpanel/android/mpmetrics/FirstTimeEventChecker.java	Registers the custom operators before evaluating pending-event property filters.
analytics/src/test/java/com/mixpanel/android/mpmetrics/CustomOperatorsTest.java	Covers comparison semantics, malformed values, strict date validation, and oversized targets.
analytics/src/androidTest/java/com/mixpanel/android/mpmetrics/FirstTimeEventTest.java	Exercises SemVer and datetime filters through the pending-event activation flow.
analytics/build.gradle	Adds the Semver4j implementation dependency.

_{Reviews (3): Last reviewed commit: "update" | Re-trigger Greptile}