Add search block headers for wal blocks #963
Merged
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What this PR does:
Maintains a search blocker header for wal blocks like #943 did for completed blocks. This helps eliminate blocks from the search faster for non-existent or sparse values.
The wal requires a mutable header, so some refactoring was done to better fit the search pipeline and the various trace/page/block structs together, i.e. the pipeline can now match directly against a SearchBlockHeaderMutable.
Which issue(s) this PR fixes:
Fixes some of #932
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]