New Feature Flag targeting operators and various fixes

• Adds semver and date comparison operators for Feature Flags targeting rules.
• Fixes a bug where session recording could break an app's own fetch() calls when a Request object was passed to them.
• Fixes autocapture link tracking to avoid navigating to an invalid location when a tracked link has no href.
• Fixes a couple of security hardening issues around string handling and URL parsing, with no change in behavior.
• Updates @mixpanel/rrweb to the latest version.
• Shrinks the published npm package by no longer including internal build and test tooling.