Heartbeat throttling interval should be configurable and default interval should be greater than 0

[bergundy]

The Java SDK should implement the new heartbeat throttling behavior:

Add 2 new WorkerOptions:

• maxHeartbeatThrottleInterval - default 60s
• defaultHeartbeatThrottleInterval - default 30s

throttleInterval = min(

heartbeat_timeout * .8 if heartbeat_timeout is provided

else defaultHeartbeatThrottleInterval

, maxHeartbeatThrottleInterval)

Rationale

• Make the behavior explicit and configurable
• Keep the behavior backwards compatible
  • Java currently has an implicit maximum (30s) and default (0)
  • Go has an implicit default (10m) and no maximum
  • Core is not yet stable, from user feedback the behavior is confusing
• Not heartbeating means no cancellations, need a default value
• Consistency between the SDKs

GoSDK equivalent task: temporalio/sdk-go#656