feat: @crudy/pgmorbac ships the SQL of each signed pgmorbac release

prepack downloads the release whose version matches package.json, verifies the
Ed25519 manifest against the pinned release key and the zip against its sha256,
and only then extracts the control file and scripts into sql/. No SQL is
committed here.

index.d.ts

@@ -0,0 +1,16 @@
+/** Absolute path to the directory holding pgmorbac.control and the SQL scripts. */
+export declare const sqlDir: string;
+/** Absolute path to pgmorbac.control. */
+export declare const controlFile: string;
+/** The extension version (default_version in pgmorbac.control). */
+export declare const version: string;
+/** The install script pgmorbac--<version>.sql, as CREATE EXTENSION would run it. */
+export declare function extensionSql(): string;
+export interface UpgradeScript {
+    from: string;
+    to: string;
+    filename: string;
+    sql: string;
+}
+/** Upgrade scripts pgmorbac--<from>--<to>.sql, in version order. */
+export declare function upgradeScripts(): UpgradeScript[];