feat: add multi-line pretty formatting for ALTER TABLE statements

- Format each ALTER TABLE clause on its own line when pretty: true
- Enhanced CONSTR_IDENTITY formatting with proper indentation for sequence options
- Each sequence option appears on its own line with consistent indentation
- Follows existing pretty formatting patterns used throughout the deparser

Example output:
ALTER TABLE public.table1
  ALTER COLUMN id ADD GENERATED ALWAYS AS IDENTITY (
    SEQUENCE NAME public.table1
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE
    NO MAXVALUE
    CACHE 1
  )

Co-Authored-By: Dan Lynch <[email protected]>

Author: devin-ai-integration[bot]

packages/deparser/__tests__/pretty/__snapshots__/alter-table-column.test.ts.snap

@@ -2,4 +2,14 @@
 
 exports[`non-pretty: original/alter/alter-table-column-1.sql 1`] = `"ALTER TABLE public.table1 ALTER COLUMN id ADD GENERATED ALWAYS AS IDENTITY (SEQUENCE NAME public.table1 START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1)"`;
 
-exports[`pretty: original/alter/alter-table-column-1.sql 1`] = `"ALTER TABLE public.table1 ALTER COLUMN id ADD GENERATED ALWAYS AS IDENTITY (SEQUENCE NAME public.table1 START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1)"`;
+exports[`pretty: original/alter/alter-table-column-1.sql 1`] = `
+"ALTER TABLE public.table1 
+  ALTER COLUMN id ADD GENERATED ALWAYS AS IDENTITY (
+    SEQUENCE NAME public.table1
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1
+  )"
+`;

packages/deparser/src/deparser.ts

@@ -2744,7 +2744,12 @@ export class Deparser implements DeparserVisitor {
               }
               return this.visit(option, context);
             });
-          output.push(`(${optionStrs.join(' ')})`);
+          if (context.isPretty()) {
+            const indentedOptions = optionStrs.map(option => context.indent(option));
+            output.push('(\n' + indentedOptions.join('\n') + '\n)');
+          } else {
+            output.push(`(${optionStrs.join(' ')})`);
+          }
         }
         break;
       case 'CONSTR_PRIMARY':
@@ -4689,10 +4694,7 @@ export class Deparser implements DeparserVisitor {
         const commandsStr = commands
           .map(cmd => {
             const cmdStr = this.visit(cmd, alterContext);
-            if (cmdStr.startsWith('ADD CONSTRAINT') || cmdStr.startsWith('ADD ')) {
-              return context.newline() + context.indent(cmdStr);
-            }
-            return cmdStr;
+            return context.newline() + context.indent(cmdStr);
           })
           .join(',');
         output.push(commandsStr);