Add the "interstage-heuristic" that attempts to avoid wildly inefficient

queries that use table scans instead of index lookups because the output
row estimates are inaccurate.

FossilOrigin-Name: 7bf49e2c54c9f6f336416f01c0e76aaf70f1e2f3fd612232e5a33ae5dabe0900

diff --cc manifest
index 9947cad665c5b6f4ffbf12d1543698d512ca4252,790c61ed9b1a6f42967aaaf05dab096666a938a6..e296c36245929af63ab0a51373dffab84e3f2d24
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\san\sASAN\sproblem\sin\spart\sof\sthe\stest\sharness.\s\sNo\schanges\sto\sSQLite\sitself.
- D 2024-04-04T13:36:48.714
 -C Fix\stypos\sin\scomments.\s\sProvided\s".wheretrace"\sdebugging\soutput\sfor\sthe\ninterstage\sheuristic\smodule.\s\sDo\somit\sautomatic\sindex\sloops\sin\sthe\ninterstage\sheuristic.
 -D 2024-04-02T14:12:29.323
++C Add\sthe\s"interstage-heuristic"\sthat\sattempts\sto\savoid\swildly\sinefficient\nqueries\sthat\suse\stable\sscans\sinstead\sof\sindex\slookups\sbecause\sthe\soutput\nrow\sestimates\sare\sinaccurate.
++D 2024-04-04T14:26:42.961
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -2183,8 -2184,8 +2184,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P c49ec239eddde6f07f8d528cccd6224c4c80b240dc8f5c974186e3bb08afb83b
- R 7af8cb79e580778082df3d4aa754bb75
 -P 8018417b0143ea11535f2457bf3e4b3755717c554a17df1076425b4251b5f2c6
 -R 9b55b3987ec7e07bd641f4ba8c80fe98
++P 797cda7ddcceb140330d58892c3e73d28df72b638df00fd48f07dfcba7706c5f 186dcae19e249db36de15f295999cff25063b54ee3d5d481cd2ba99b6d13148e
++R 869b12f296c2e2b0f215f1adb6cf5942
++T +closed 186dcae19e249db36de15f295999cff25063b54ee3d5d481cd2ba99b6d13148e
  U drh
- Z e0623a1804a9fd12482c3193ee60e8ba
 -Z 1d7be0abb1ed0f4f893f7da5731cd389
++Z 93e4543ac83acbe7df90dc3896cd40af
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 12ab17b4c2aea2f5c0fc4f3553980dcbf9e2e817,5063c5ac669cf0d58af27093430112ee71ac61ba..e59021c9b1cbab4789fca8966adf77003cba19c0
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 797cda7ddcceb140330d58892c3e73d28df72b638df00fd48f07dfcba7706c5f
 -186dcae19e249db36de15f295999cff25063b54ee3d5d481cd2ba99b6d13148e
++7bf49e2c54c9f6f336416f01c0e76aaf70f1e2f3fd612232e5a33ae5dabe0900