Fix concurrency issues (#142)

* Fix the OS FD error

* Cache the compiler versions

* Allow for auto display impl in declare wrapper type macro

* Better logging and fix concurrency issues

* Fix tests

* Format

* Make the code even more concurrent

crates/core/src/cached_compiler.rs

@@ -62,8 +62,9 @@ impl CachedCompiler {
             compiler_version_or_requirement,
         )
         .await?;
-        let compiler_version =
-            <P::Compiler as SolidityCompiler>::new(compiler_path.clone()).version()?;
+        let compiler_version = <P::Compiler as SolidityCompiler>::new(compiler_path.clone())
+            .version()
+            .await?;
 
         let cache_key = CacheKey {
             platform_key: P::config_id().to_string(),