Add SQLITE_STMTSTATUS_CACHE_HIT/MISS and SQLITE_DB_STATUS_CACHE_HIT/MISS. For querying the number of pager cache hits and misses on a statement or connection basis.

FossilOrigin-Name: 892723575c033ed3f02cf6ea61e08f039b9a0c40

• manifest[diff]
• manifest.uuid[diff]
• src/pager.c[diff]
• src/pager.h[diff]
• src/sqlite.h.in[diff]
• src/sqliteInt.h[diff]
• src/status.c[diff]
• src/test1.c[diff]
• src/test_malloc.c[diff]
• src/vdbe.c[diff]
• src/vdbeInt.h[diff]
• src/vdbeblob.c[diff]
• test/stmtstatus.test[Added - diff]