Seed wait stats config file (#215 part 1)

Adds src/PlanViewer.Core/Resources/WaitStats.json as the single source
of truth for wait stat handling, populated only with attributes 1-5
(name, isPreemptive, isExternal, isImplemented, isEnabled). Attributes
6-12 (calc model, applicable operators, descriptions, URLs, internal
comment) are intentionally null pending domain-expert review.

52 entries: 46 currently implemented (matched explicitly or via prefix
in BenefitScorer / PlanViewerControl / WaitStatsKnowledge), 6 common
waits that today fall to the 'Other' bucket (THREADPOOL, BACKUPIO,
BACKUPBUFFER, HADR_SYNC_COMMIT, DBMIRROR_DBM_EVENT, SQLTRACE_BUFFER_FLUSH).

No code is wired to this file yet — that's part 2.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: erikdarlingdata