2.16.10 Pull improvements and simplification

JetStream

• For JS Subs, expose the consumer name since it's already tracked #869 @scottf
• Part 1 in pull handling improvements #870 @scottf
• Part 2 in pull handling improvements #871 @scottf
• Time used fetching should never be negative #878 @liu-jianyang
• Pull-fetch-time-left #879 @liu-jianyang
• Simplification Part 1 #848 @scottf
• Simplification (Experimental) Part 2 #882 @scottf
• Simplification pre-experimental-release #884 @scottf

Core

• fix rehost #874 @scottf
• Options Builder constructor that takes existing Options #875 @scottf
• StreamConfiguration and ConsumerConfiguration metadata support #877 @scottf

Misc / Test

• JsonValue improvement #868 @scottf
• consume test for bytes can't run until at least 2.9.1 #883 @scottf
• added metadata map to service and endpoints #862 @scottf