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/DuckDBListValue.ts

@@ -0,0 +1,23 @@
+import { displayStringForDuckDBValue } from './conversion/displayStringForDuckDBValue.js';
+import { jsonFromDuckDBValue } from './conversion/jsonFromDuckDBValue.js';
+import { DuckDBValue } from './DuckDBValue.js';
+import { Json } from './Json.js';
+import { SpecialDuckDBValue } from './SpecialDuckDBValue.js';
+
+export class DuckDBListValue extends SpecialDuckDBValue {
+  public readonly values: readonly DuckDBValue[];
+
+  constructor(values: readonly DuckDBValue[]) {
+    super();
+    this.values = values;
+  }
+
+  public toDuckDBString(): string {
+    const valueStrings = this.values.map(displayStringForDuckDBValue);
+    return `[${valueStrings.join(', ')}]`;
+  }
+
+  public toJson(): Json {
+    return this.values.map(jsonFromDuckDBValue);
+  }
+}