Evm move (#2790)

Move EVM to a standalone module

Move the EVM classes to a standalone module. This is mostly moves but
some API re-resign to peel out some features not essential to the EVM,
such as privacy support and ties to the data storage subsystem.

Signed-off-by: Danno Ferrin <danno.ferrin@gmail.com>

datatypes/build.gradle

@@ -43,3 +43,16 @@ dependencies {
 }
 
 configurations { testArtifacts }
+
+publishing {
+  publications {
+    mavenJava(MavenPublication) {
+      groupId 'org.hyperledger.besu'
+      artifactId 'besu-datatypes'
+      pom {
+        name = 'Besu Datatypes'
+        description = 'Cross-module datatypes'
+      }
+    }
+  }
+}