factor: optimize for u128 performance with modular architecture

Author: naoNao89

.vscode/cspell.dictionaries/jargon.wordlist.txt

@@ -202,3 +202,30 @@ TUNABLES
 tunables
 VMULL
 vmull
+accum
+biguint
+BSGS
+bsgs
+coeff
+cofactor
+coprimes
+funcs
+Lenstra's
+modpow
+montg
+mult
+mulmod
+newr
+powmod
+precomp
+REDC
+redc
+sqmod
+Suyama
+SUYAMA
+unfactored
+semiprimes
+addmod
+mults
+Sorenson
+Raphson