feat(muscript): add ExtensibleExpr.optimize in preparation for muscript-optimizer

muscript-ast/src/main/java/io/gitlab/jfronny/muscript/ast/extensible/ExtensibleBoolExpr.java

@@ -3,4 +3,8 @@ package io.gitlab.jfronny.muscript.ast.extensible;
 import io.gitlab.jfronny.muscript.ast.BoolExpr;
 
 public non-sealed interface ExtensibleBoolExpr extends BoolExpr, ExtensibleExpr {
+    @Override
+    default BoolExpr optimize() {
+        return this;
+    }
 }

muscript-ast/src/main/java/io/gitlab/jfronny/muscript/ast/extensible/ExtensibleDynamicExpr.java

@@ -3,4 +3,8 @@ package io.gitlab.jfronny.muscript.ast.extensible;
 import io.gitlab.jfronny.muscript.ast.DynamicExpr;
 
 public non-sealed interface ExtensibleDynamicExpr extends DynamicExpr, ExtensibleExpr {
+    @Override
+    default DynamicExpr optimize() {
+        return this;
+    }
 }

muscript-ast/src/main/java/io/gitlab/jfronny/muscript/ast/extensible/ExtensibleExpr.java

@@ -1,7 +1,9 @@
 package io.gitlab.jfronny.muscript.ast.extensible;
 
+import io.gitlab.jfronny.muscript.ast.Expr;
 import io.gitlab.jfronny.muscript.core.ExprWriter;
 
-public interface ExtensibleExpr {
+public sealed interface ExtensibleExpr permits ExtensibleBoolExpr, ExtensibleDynamicExpr, ExtensibleNumberExpr, ExtensibleStringExpr {
     void decompile(ExprWriter writer);
+    Expr optimize();
 }

muscript-ast/src/main/java/io/gitlab/jfronny/muscript/ast/extensible/ExtensibleNumberExpr.java

@@ -3,4 +3,8 @@ package io.gitlab.jfronny.muscript.ast.extensible;
 import io.gitlab.jfronny.muscript.ast.NumberExpr;
 
 public non-sealed interface ExtensibleNumberExpr extends NumberExpr, ExtensibleExpr {
+    @Override
+    default NumberExpr optimize() {
+        return this;
+    }
 }

muscript-ast/src/main/java/io/gitlab/jfronny/muscript/ast/extensible/ExtensibleStringExpr.java

@@ -3,4 +3,8 @@ package io.gitlab.jfronny.muscript.ast.extensible;
 import io.gitlab.jfronny.muscript.ast.StringExpr;
 
 public non-sealed interface ExtensibleStringExpr extends StringExpr, ExtensibleExpr {
+    @Override
+    default StringExpr optimize() {
+        return this;
+    }
 }