Description

Adds a new consumer-side URI option enableBatchIndexAcknowledgment to the camel-pulsar
component.

The Pulsar client's ConsumerBuilder supports
enableBatchIndexAcknowledgment(boolean) to allow each message in a batch to be acknowledged
independently. With the option disabled (the Pulsar client default), a single failed
acknowledgment causes the broker to redeliver the entire batch — including messages that were
processed successfully. The component previously built the ConsumerBuilder without invoking
this method and exposed no URI parameter to configure it.

This change:

• Adds the option as a @UriParam(label = "consumer") field on PulsarConfiguration with
  default false (matches the Pulsar client's own default — no behaviour change for existing
  routes).
• Wires it into CommonCreationStrategyImpl in the same shape as the existing readCompacted
  option (unconditional pass-through onto the ConsumerBuilder).
• Adds a default-value assertion to PulsarComponentTest.testPulsarEndpointDefaultConfiguration
  and a new URI-parsing test testPulsarEndpointEnableBatchIndexAcknowledgment.

Enabling this option also requires the Pulsar broker to be configured with
acknowledgmentAtBatchIndexLevelEnabled=true for the per-message acknowledgments to take
effect. This is documented in the option's description.

Resolves https://issues.apache.org/jira/browse/CAMEL-23443

Target

• I checked that the commit is targeting the correct branch (Camel 4 uses the main branch)

Tracking

• If this is a large change, bug fix, or code improvement, I checked there is a JIRA issue filed for the change (usually before you start working on it).

Apache Camel coding standards and style

• I checked that each commit in the pull request has a meaningful subject line and body.

• I have run mvn clean install -DskipTests locally from root folder and I have committed all auto-generated changes.