Improved precision of binary-to-decimal conversion of floating-point values

on all systems but especially non-x86 systems that lake extended precision
hardward floating point.

FossilOrigin-Name: 32befb224b254639e756fd493f300507ff60c5222e00a7338dbcd39140133964

diff --cc manifest
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- C Add\ssupport\sfor\ssqlite3_stmt_scanstatus_v2()\sprofiling\sof\sGROUP\sBY\sclauses\sthat\suse\sa\stemp\sb-tree,\sand\sfor\ssub-queries\simplemented\sas\sco-routines.
- D 2023-06-30T18:31:37.545
 -C Whether\sor\snot\sto\suse\sthe\slong-double\sfloating\spoint\sconversion\stechnique\nis\snow\sa\stest-control\ssetting.
 -D 2023-07-03T14:56:49.741
++C Improved\sprecision\sof\sbinary-to-decimal\sconversion\sof\sfloating-point\svalues\non\sall\ssystems\sbut\sespecially\snon-x86\ssystems\sthat\slake\sextended\sprecision\nhardward\sfloating\spoint.
++D 2023-07-03T15:03:59.842
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