feat: Make typo factor configurable

Fixes https://github.com/valeriansaliou/sonic/issues/394.

config.cfg

@@ -55,6 +55,8 @@ suggest_limit_maximum = 20
 list_limit_default = 100
 list_limit_maximum = 500
 
+typo_factor_word_lengths = [4, 7, 10]
+
 
 [store.kv]
 path = "./data/store/kv/"