Add the sqlite3_vtab_rhs_value() interface, allowing the xBestIndex method

of a virtual table to access known values on the right-hand side of
constraint expressions.

FossilOrigin-Name: e19a0b132a641f0e9f3d72586af538b95b4db8665b1555f84bc0a291bf1a4056

diff --cc manifest
index 9cea17bdcad68cde6fbc08cf12c7fae984cf6061,ec69532efbed4d23e69203e56d2c37a2e64c9653..0cfb4d209430d1557f527f0ea7595b1fd32f9290
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C A\sbetter\sand\smore\srobust\sfix\sfor\sthe\sproblem\sof\sreading\sa\sread-only\sWAL\nmode\sdatabase\swith\sexisting\s-wal\sand\s-shm\sfiles,\sreplacing\s[f426874e005e3c23].
- D 2022-01-20T14:40:34.203
 -C Add\srequirements\smarks\sand\stuning.
 -D 2022-01-21T00:38:49.617
++C Add\sthe\ssqlite3_vtab_rhs_value()\sinterface,\sallowing\sthe\sxBestIndex\smethod\nof\sa\svirtual\stable\sto\saccess\sknown\svalues\son\sthe\sright-hand\sside\sof\nconstraint\sexpressions.
++D 2022-01-21T01:00:53.326
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1938,8 -1940,8 +1940,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
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+ R 90012b52ae4dda5b0e0f59cd4c524b70
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  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 9abd24dbef04422f7b58e43901cb8d0db45aae89,01f69afd183027994a9e0e5205f61ae9041b830b..569daa5f5ff3ccfe9b5016e7e5e13e8717eafedf
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 71bfd0b57ab197405606b8096b8521d784ff174c4eecf1d9804d38342c03cc80
 -ac951490fd7d5864fe422a80ee8557478e823e79461bec2ee538f57b6733eb5a
++e19a0b132a641f0e9f3d72586af538b95b4db8665b1555f84bc0a291bf1a4056