Make McpExecutor and GenerateForgePatchedSourcesTask config cache-compatible

- Added ForgeToolService to run tools in tasks
- Added AccessTransformerService to simplify applying ATs and
  to make the tool config cache-compatible
- Split McpExecutor into an execution stage (McpE) and
  a setup stage (McpExecutorBuilder)
- McpExecutor is now a service
- All StepLogic implementations are now services

src/main/java/net/fabricmc/loom/extension/LoomGradleExtensionImpl.java

@@ -298,7 +298,8 @@ public abstract class LoomGradleExtensionImpl extends LoomGradleExtensionApiImpl
 		return builder;
 	}
 
-	private boolean manualRefreshDeps() {
+	@Override
+	public boolean manualRefreshDeps() {
 		return project.getGradle().getStartParameter().isRefreshDependencies() || Boolean.getBoolean("loom.refresh");
 	}