add partition timing metrics to LeaderOnlyTokenCrawler

[wandna-amazon]

add missing partition metrics to LeaderOnlyTokenCrawler

aligns LeaderOnlyTokenCrawler metrics with TokenPaginationCrawler as part of the connectors metrics audit (see details)

changes

• added WorkerPartitionWaitTime metric - tracks time partitions wait before processing
• added WorkerPartitionProcessLatency metric - measures actual partition processing time
• updated executePartition() method to record both metrics
• added comprehensive test coverage following existing patterns

benefits

• consistent metrics across both crawler implementations
• better visibility into retry partition performance
• improved observability for partition processing bottlenecks

test results

./gradlew :data-prepper-plugins:saas-source-plugins:source-crawler:test --tests "*testExecutePartitionMetrics*"

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BUILD SUCCESSFUL in 7s
51 actionable tasks: 4 executed, 47 up-to-date

BUILD SUCCESSFUL in 7s 51 actionable tasks: 4 executed, 47 up-to-date