feat: add log decoding capabilities to show decoded log values for forc-test

[kayagokalp]

Description

This PR adds log decoding capabilities to forc, so that it can be used for showing actual decoded, human readable values at forc-test output.

For the following unit test:

script;

fn main() {}

#[test]
fn test_fn() {
	let a = 10;
	log(a);
	let b = 30;
	log(b);
	assert_eq(a, 10)
}

Logs are:

zbap@/Users/-/fuel/test_projects/script_main > ../../dev/sway/target/release/forc test --logs --experimental-new-encoding
  Finished debug [unoptimized + fuel] target(s) in 5.14s
      Bytecode hash: 0x562b471bae4323b806a1b2829014ef7078a5b9406a076a54cf0b2f1a61cb49f8
   Running 1 test, filtered 0 tests
      test test_fn ... ok (33.875µs, 200 gas)
Decoded log value: 10, log rb: 0
Decoded log value: 30, log rb: 1
Raw logs:
[{"LogData":{"data":"000000000000000a","digest":"8d85f8467240628a94819b26bee26e3a9b2804334c63482deacec8d64ab4e1e7","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10336,"len":8,"pc":10784,"ptr":67107840,"ra":0,"rb":0}},{"LogData":{"data":"000000000000001e","digest":"48a97e421546f8d4cae1cf88c51a459a8c10a88442eed63643dd263cef880c1c","id":"0000000000000000000000000000000000000000000000000000000000000000","is":10336,"len":8,"pc":11048,"ptr":67106816,"ra":0,"rb":1}}]
   Result: OK. 1 passed. 0 failed. Finished in 33.875µs.

Also this PR fixes a bug in test suite which causes test suite to omit the encoding information passed into forc-test from unit_tests_pass tests. And adds log decode testing capabilities to the test suite.

Next up is adding actual variable names instead of log id so that decoded log values will show as, this is left to a future PR

Decoded log: ( a = 10 )
Decoded log: ( b = 30 )

[JoshuaBatty]

Nice work