Add a common crate (#75)

* Add a barebones common crate

* Refactor some code into the common crate

* Add a `ResolverApi` interface.

This commit adds a `ResolverApi` trait to the `format` crate that can be
implemented by any type that can act as a resolver. A resolver is able
to provide information on the chain state. This chain state could be
fresh or it could be cached (which is something that we will do in a
future PR).

This cleans up our crate graph so that `format` is not depending on the
node interactions crate for the `EthereumNode` trait.

* Cleanup the blocking executor

crates/format/src/case.rs

@@ -1,7 +1,8 @@
 use serde::Deserialize;
 
+use revive_dt_common::macros::define_wrapper_type;
+
 use crate::{
-    define_wrapper_type,
     input::{Expected, Input},
     mode::Mode,
 };
@@ -45,5 +46,5 @@ impl Case {
 define_wrapper_type!(
     /// A wrapper type for the index of test cases found in metadata file.
     #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
-    CaseIdx(usize);
+    pub struct CaseIdx(usize);
 );