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: 4/5

The PR is not yet safe to merge because negative fractional epoch-millisecond targets can mis-evaluate pre-1970 date rules.

The previously reported rounding mismatch remains: RFC3339 conversion and negative millisecond conversion round equivalent instants in opposite directions.

Files Needing Attention: lib/mixpanel-ruby/flags/custom_operators.rb

Important Files Changed

Filename	Overview
lib/mixpanel-ruby/flags/custom_operators.rb	Implements custom date and SemVer comparisons; negative fractional epoch milliseconds remain inconsistent with equivalent RFC3339 instants.
lib/mixpanel-ruby/flags/local_flags_provider.rb	Registers the custom operators and requires runtime rules to return Boolean true.
mixpanel-ruby.gemspec	Updates the JSONLogic runtime dependency to the 0.2 release line.

_{Reviews (3): Last reviewed commit: "updating tests and adding semver limits" | Re-trigger Greptile}

[codecov]

Codecov Report

❌ Patch coverage is 98.19820% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.28%. Comparing base (35be7ba) to head (8c41ae4).

Files with missing lines	Patch %	Lines
lib/mixpanel-ruby/flags/custom_operators.rb	98.16%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
+ Coverage   97.16%   97.28%   +0.12%     
==========================================
  Files          15       16       +1     
  Lines         775      885     +110     
==========================================
+ Hits          753      861     +108     
- Misses         22       24       +2     

Flag	Coverage Δ
openfeature	100.00% <ø> (ø)

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