Refactor parameters that adjust fuzzer behavior

[plotchy]

As I've been learning more about the fuzzer I've found it difficult to remember where to adjust these hyperparameters. I've kept the % chances the same, but standardized sampling sizes and labeled constants

Also, I fixed a bug where random u8 values are generated with .below(255). Since below() is exclusive on the input, this needs to be .below(256) to generate a random u8

[plotchy]

There are some overlapping ranges in the match statements, but they are intentional. Matches don't support exclusive ranges for constants atm.

[fuzzland-bot]

Found: 19

Project Name	Vulnerability Found	Time Taken	Log
BIGFI_exp.txt	✅ Price Manipulation	0h-0m-40s	Log File
Shadowfi_exp.txt	✅ Price Manipulation	0h-2m-36s	Log File
SEAMAN_exp.txt	✅ Fund Loss	0h-2m-17s	Log File
BEGO_exp.txt	✅ Fund Loss	0h-0m-11s	Log File
cftoken_exp.txt	✅ Fund Loss	0h-0m-25s	Log File
Carrot_exp.txt	❌	-1	Log File
MBC_ZZSH_exp.txt	❌	-1	Log File
AUR_exp.txt	❌	-1	Log File
SellToken_exp.txt	✅ Fund Loss	0h-0m-36s	Log File
ROI_exp.txt	✅ Fund Loss	0h-0m-16s	Log File
GPT_exp.txt	❌	-1	Log File
OLIFE_exp.txt	❌	-1	Log File
THB_exp.txt	✅ Fund Loss	0h-1m-56s	Log File
VerilogCTF.txt	❌‼️ Crashed	-1	Log File
CS_exp.txt	✅ Price Manipulation	0h-0m-24s	Log File
MintoFinance_exp.txt	✅ Fund Loss	0h-0m-11s	Log File
Novo_exp.txt	✅ Price Manipulation	0h-1m-14s	Log File
SELLC03_exp.txt	✅ Fund Loss	0h-0m-53s	Log File
Yyds_exp.txt	✅ Fund Loss	0h-0m-26s	Log File
DYNA_exp.txt	❌	-1	Log File
EAC_exp.txt	❌	-1	Log File
Annex_exp.txt	❌	-1	Log File
PLTD_exp.txt	✅ Price Manipulation	0h-1m-31s	Log File
ApeDAO_exp.txt	✅ Price Manipulation	0h-0m-26s	Log File
GSS_exp.txt	✅ Price Manipulation	0h-0m-54s	Log File
Axioma_exp.txt	✅ Fund Loss	0h-0m-34s	Log File
RFB_exp.txt	✅ Fund Loss	0h-0m-42s	Log File
HEALTH_exp.txt	✅ Price Manipulation	0h-0m-10s	Log File