Remove Decl from AST Facade

This PR removes the `Decl` union type because it might be misleading. It could be understood to contain any possible declaration whereas it only contains declarations that are allowed in `export` statements. However, it doesn't include other identifier declarations like: named `function expressions`, `class expressions`, parameters, etc....

We may want to re-introduce a form of `Decl` in the future if we see usage for it.

crates/rome_formatter/src/ts/declarators/mod.rs

@@ -1,3 +1,2 @@
-mod decl;
 mod fn_decl;
 mod variable_declaration_statement;

crates/rome_formatter/src/ts/statements/statement.rs

@@ -49,7 +49,11 @@ impl ToFormatElement for JsAnyStatement {
 			}
 
 			JsAnyStatement::ForOfStmt(_) => todo!(),
-			JsAnyStatement::Decl(decl) => decl.to_format_element(formatter),
+			JsAnyStatement::FnDecl(decl) => decl.to_format_element(formatter),
+			JsAnyStatement::ClassDecl(decl) => decl.to_format_element(formatter),
+			JsAnyStatement::JsVariableDeclarationStatement(decl) => {
+				decl.to_format_element(formatter)
+			}
 			JsAnyStatement::JsUnknownStatement(_) => todo!(),
 			JsAnyStatement::ImportDecl(_) => todo!(),
 			JsAnyStatement::ExportNamed(_) => todo!(),
@@ -63,6 +67,11 @@ impl ToFormatElement for JsAnyStatement {
 			JsAnyStatement::JsTryFinallyStatement(try_finally) => {
 				try_finally.to_format_element(formatter)
 			}
+			JsAnyStatement::TsEnum(_) => todo!(),
+			JsAnyStatement::TsTypeAliasDecl(_) => todo!(),
+			JsAnyStatement::TsNamespaceDecl(_) => todo!(),
+			JsAnyStatement::TsModuleDecl(_) => todo!(),
+			JsAnyStatement::TsInterfaceDecl(_) => todo!(),
 		}
 	}
 }