feat: 项目初始化。

script/sql/update/postgres/update_5.3.0-5.3.1.sql

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+ALTER TABLE flow_node DROP COLUMN skip_any_node;
+ALTER TABLE flow_node ADD COLUMN ext varchar(500);
+COMMENT ON COLUMN flow_node.ext IS '扩展属性';
+CREATE INDEX user_associated_idx ON FLOW_USER USING btree (associated);
+
+ALTER TABLE sys_oss ADD COLUMN ext1 varchar(500));
+COMMENT ON COLUMN sys_oss.ext1 IS '扩展属性';