add duckdb-ui-client & other ts pkgs (#10)

* add duckdb-ui-client & other ts pkgs

* workflow fixes

* fix working dir

* no sparse checkout; specify package.json path

* path to pnpm-lock.yaml

* add check & build test

* workflow step descriptions

* use comments & names

* one more naming tweak

ts/pkgs/duckdb-data-values/src/conversion/hexFromBlob.ts

@@ -0,0 +1,20 @@
+export function hexFromBlob(
+  blob: Uint8Array,
+  start: number | undefined,
+  end: number | undefined,
+): string {
+  if (start === undefined) {
+    start = 0;
+  }
+  if (end === undefined) {
+    end = blob.length;
+  }
+  let hex = '';
+
+  for (let i = start; i < end; i++) {
+    const byte = blob[i];
+    // Ensure each byte is 2 hex characters
+    hex += (byte < 16 ? '0' : '') + byte.toString(16);
+  }
+  return hex;
+}