Enhance the WHERE-clause push-down optimization so that it is able to

push down WHERE clause terms that contain uncorrelated subqueries.

FossilOrigin-Name: 69ec714b2d698acf9e37635256c01b233ce32f22e8323e226441d5ddd948a940

diff --cc manifest
index ab3870e60d7dba14be9c30da85e9e22f219bd2aa,f59889aa63b5b05aa354dd109fdc3cc880fc5cdb..739651c9100428bc58ded4d41b61407ce4be540b
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sa\sharmless\scompiler\swarning\sin\sthe\sICU\sextension\sdue\sto\s[acddbc489d5231da].
- D 2024-04-08T11:45:15.171
 -C Enhancements\sto\sthe\sfuzzer\sinvariant\schecker\sto\sturn\soptimizations\son\sand\noff.
 -D 2024-04-08T06:37:19.669
++C Enhance\sthe\sWHERE-clause\spush-down\soptimization\sso\sthat\sit\sis\sable\sto\npush\sdown\sWHERE\sclause\sterms\sthat\scontain\suncorrelated\ssubqueries.
++D 2024-04-08T11:50:07.908
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -2184,8 -2184,8 +2184,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index c8513ea3a33a804c0c8a6c08a3d1825e52b91e1f,30cfd87b8ff8d88abffbc915a6b13805e0a9bfa1..35e356a937df39e7423bec164038df6c696a70d7
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 3d8750e88558f8ea6a1523a5add4ccca3262e31f348b603e56ab193d81908995
 -67594481379824823105939fea2ce1fe280667f6db91735ac78b4b6164a78dab
++69ec714b2d698acf9e37635256c01b233ce32f22e8323e226441d5ddd948a940