Prevent eviction of internal pages while reconciling leaf pages which could refer to their memory

linux-directio failed on RHEL 8.0

Host: ec2-52-23-173-137.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-6077 Add new stats to track compact progress (#7057)

• Add new stat to track start and stop of compaction
• Add stat to track instances where compact halted due to cache pressure
• Add stats for scenarios where compaction is halted as process wouldn't yield space savings
• Add a stat at connection level that tracks early termination of btree compaction as it wouldn't result in enough space savings
• Add new stats to track the pages being processed by tree walk as part of compaction
• Track compaction progress in block manager unconditionally | 13 Oct 21 22:24 UTC
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