Support raw byte grammar in NautilusContext

[sadeli413]

Adds feature for issue #1867

[domenukk]

running 2 tests
test libafl/src/generators/nautilus.rs - generators::nautilus::NautilusContext::with_rules (line 49) ... FAILED
test libafl/src/executors/command.rs - executors::command::CommandConfigurator (line 621) ... ok

failures:

---- libafl/src/generators/nautilus.rs - generators::nautilus::NautilusContext::with_rules (line 49) stdout ----
error[E0433]: failed to resolve: use of undeclared type `NautilusContext`
  --> libafl/src/generators/nautilus.rs:66:15
   |
19 | let context = NautilusContext::with_rules(100, &rules).unwrap();
   |               ^^^^^^^^^^^^^^^ use of undeclared type `NautilusContext`
   |
help: consider importing this struct
   |
3  + use libafl::prelude::NautilusContext;
   |

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0433`.
Couldn't compile the test.

failures:
    libafl/src/generators/nautilus.rs - generators::nautilus::NautilusContext::with_rules (line 49)

[domenukk]

Note that comments are run as tests, too

[domenukk]

Thanks!