improvement(tables): raise the max column limit to 1000 (#6295)

Bumps TABLE_LIMITS.MAX_COLUMNS_PER_TABLE from 50 to 1000. Every validation site (schema validation, add-column, bulk add, workflow output columns, and the boundary contract) already derives from this constant.

Author: TheodoreSpeaks

apps/sim/lib/table/constants.ts

@@ -9,7 +9,7 @@ export const TABLE_LIMITS = {
   MAX_TABLES_PER_WORKSPACE: 100,
   MAX_ROWS_PER_TABLE: 10000,
   MAX_ROW_SIZE_BYTES: 400 * 1024, // 400KB
-  MAX_COLUMNS_PER_TABLE: 50,
+  MAX_COLUMNS_PER_TABLE: 1000,
   MAX_TABLE_NAME_LENGTH: 128,
   MAX_COLUMN_NAME_LENGTH: 50,
   MAX_DESCRIPTION_LENGTH: 500,