evmtool was not respecting the --genesis option (#7518)

* EVMTool should respect --genesis option

Update the code so that the genesis file option will be respected when
set. Also, default --fork options should set a rational base fee.

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

---------

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

datatypes/src/main/java/org/hyperledger/besu/datatypes/HardforkId.java

@@ -14,6 +14,9 @@
  */
 package org.hyperledger.besu.datatypes;
 
+import java.util.Comparator;
+import java.util.stream.Stream;
+
 /** Description and metadata for a hard fork */
 public interface HardforkId {
 
@@ -112,6 +115,19 @@ public interface HardforkId {
     public String description() {
       return description;
     }
+
+    /**
+     * The most recent finalized mainnet hardfork Besu supports. This will change across versions
+     * and will be updated after mainnet activations.
+     *
+     * @return the most recently activated mainnet spec.
+     */
+    public static MainnetHardforkId mostRecent() {
+      return Stream.of(MainnetHardforkId.values())
+          .filter(MainnetHardforkId::finalized)
+          .max(Comparator.naturalOrder())
+          .orElseThrow();
+    }
   }
 
   /** List of all Ethereum Classic hard forks. */