Remove libfuzzer support from the fuzzer

[lrubasze]

Additional changes:

• Update fuzzer README
• Update .gitignore
• Make sure simple-fuzzer is used when generating raw input

[github-actions]

Benchmark for a0ebb0e

Click to view benchmark

Test	Base	PR	%
costing::bench_prepare_wasm	79.6±0.60ms	79.7±0.45ms	+0.13%
costing::decode_sbor	16.7±0.06µs	16.4±0.01µs	-1.80%
costing::decode_sbor_bytes	46.1±0.12µs	51.4±0.13µs	+11.50%
costing::deserialize_wasm	1398.0±2.00µs	1396.6±24.65µs	-0.10%
costing::instantiate_flash_loan	4.3±0.58ms	4.1±0.03ms	-4.65%
costing::instantiate_radiswap	5.7±0.05ms	5.8±0.06ms	+1.75%
costing::spin_loop	26.4±0.10ms	28.7±0.09ms	+8.71%
costing::validate_sbor_payload	30.9±0.06µs	30.7±0.18µs	-0.65%
costing::validate_sbor_payload_bytes	379.2±0.70ns	378.1±1.03ns	-0.29%
costing::validate_secp256k1	87.5±0.04µs	87.6±0.05µs	+0.11%
costing::validate_wasm	43.0±0.09ms	44.1±0.16ms	+2.56%
decimal::add/0	9.3±0.00ns	9.3±0.00ns	0.00%
decimal::add/rust-native	10.9±0.01ns	10.9±0.01ns	0.00%
decimal::add/wasmer	133.3±0.12ns	131.8±0.18ns	-1.13%
decimal::add/wasmer-call-native	543.5±0.33ns	546.1±0.73ns	+0.48%
decimal::add/wasmi	905.0±5.57ns	915.9±5.38ns	+1.20%
decimal::add/wasmi-call-native	8.2±0.05µs	8.3±0.02µs	+1.22%
decimal::div/0	198.5±0.19ns	200.4±0.39ns	+0.96%
decimal::from_string/0	160.2±0.29ns	161.6±0.45ns	+0.87%
decimal::mul/0	156.5±0.22ns	154.6±0.55ns	-1.21%
decimal::mul/rust-native	152.7±0.20ns	151.8±0.46ns	-0.59%
decimal::mul/wasmer	1681.5±0.67ns	1680.9±4.81ns	-0.04%
decimal::mul/wasmer-call-native	702.8±0.95ns	702.8±0.65ns	0.00%
decimal::mul/wasmi	60.7±0.07µs	60.7±0.06µs	0.00%
decimal::mul/wasmi-call-native	8.4±0.00µs	8.4±0.01µs	0.00%
decimal::pow/0	726.0±4.25ns	723.3±0.63ns	-0.37%
decimal::pow/rust-native	696.8±0.47ns	697.2±0.88ns	+0.06%
decimal::pow/wasmer	7.3±0.01µs	7.4±0.00µs	+1.37%
decimal::pow/wasmer-call-native	1180.4±0.86ns	1178.0±2.48ns	-0.20%
decimal::pow/wasmi	288.1±0.50µs	287.7±0.20µs	-0.14%
decimal::pow/wasmi-call-native	7.5±0.01µs	7.5±0.01µs	0.00%
decimal::root/0	9.5±0.01µs	9.6±0.60µs	+1.05%
decimal::sub/0	9.4±0.01ns	9.4±0.01ns	0.00%
decimal::to_string/0	483.3±0.40ns	483.3±0.33ns	0.00%
precise_decimal::add/0	10.5±0.14ns	11.1±0.00ns	+5.71%
precise_decimal::add/rust-native	12.7±0.00ns	12.7±0.00ns	0.00%
precise_decimal::add/wasmer	138.7±0.09ns	132.8±0.17ns	-4.25%
precise_decimal::add/wasmer-call-native	578.1±0.45ns	580.1±11.35ns	+0.35%
precise_decimal::add/wasmi	1091.0±6.19ns	1107.8±3.71ns	+1.54%
precise_decimal::add/wasmi-call-native	8.7±0.17µs	8.8±0.05µs	+1.15%
precise_decimal::div/0	326.0±0.83ns	327.8±0.40ns	+0.55%
precise_decimal::from_string/0	220.1±0.78ns	218.5±0.25ns	-0.73%
precise_decimal::mul/0	350.8±2.10ns	372.4±4.51ns	+6.16%
precise_decimal::mul/rust-native	326.9±1.29ns	324.8±0.98ns	-0.64%
precise_decimal::mul/wasmer	3.8±0.00µs	3.8±0.00µs	0.00%
precise_decimal::mul/wasmer-call-native	958.4±1.47ns	964.3±0.88ns	+0.62%
precise_decimal::mul/wasmi	151.7±0.14µs	152.5±0.20µs	+0.53%
precise_decimal::mul/wasmi-call-native	9.2±0.02µs	9.3±0.01µs	+1.09%
precise_decimal::pow/0	1929.0±4.48ns	1933.8±6.33ns	+0.25%
precise_decimal::pow/rust-native	1572.3±3.09ns	1568.6±3.18ns	-0.24%
precise_decimal::pow/wasmer	18.1±0.01µs	18.2±0.01µs	+0.55%
precise_decimal::pow/wasmer-call-native	2.3±0.00µs	2.3±0.00µs	0.00%
precise_decimal::pow/wasmi	736.7±0.83µs	742.6±2.35µs	+0.80%
precise_decimal::pow/wasmi-call-native	16.7±0.04µs	16.8±0.05µs	+0.60%
precise_decimal::root/0	64.3±0.20µs	63.7±0.02µs	-0.93%
precise_decimal::sub/0	10.5±0.01ns	10.5±0.02ns	0.00%
precise_decimal::to_string/0	780.1±1.51ns	780.4±3.69ns	+0.04%
schema::validate_payload	343.4±0.63µs	347.0±0.77µs	+1.05%
transaction::radiswap	8.2±0.04ms	8.2±0.03ms	0.00%
transaction::transfer	3.1±0.01ms	3.0±0.01ms	-3.23%
transaction_processing::prepare	3.0±0.01ms	2.9±0.00ms	-3.33%
transaction_processing::prepare_and_decompile	7.0±0.03ms	7.1±0.16ms	+1.43%
transaction_processing::prepare_and_decompile_and_recompile	26.3±0.15ms	27.5±0.20ms	+4.56%
transaction_validation::validate_manifest	48.7±0.03µs	48.8±0.37µs	+0.21%
transaction_validation::verify_ecdsa	84.9±0.08µs	84.9±0.10µs	0.00%
transaction_validation::verify_ed25519	61.1±0.07µs	61.1±0.05µs	0.00%