ci(node): check docs in CI (#2084)

* Make `npm run docs` fail if there are any warnings. This will catch
items missing from the API reference.
* Add a check in our CI to make sure `npm run dos` runs without warnings
and doesn't generate any new files (indicating it might be out-of-date.
* Hide constructors that aren't user facing.
* Remove unused enum `WriteMode`.

Closes #2068

docs/src/js/namespaces/embedding/interfaces/FunctionOptions.md

@@ -0,0 +1,13 @@
+[**@lancedb/lancedb**](../../../README.md) • **Docs**
+
+***
+
+[@lancedb/lancedb](../../../globals.md) / [embedding](../README.md) / FunctionOptions
+
+# Interface: FunctionOptions
+
+Options for a given embedding function
+
+## Indexable
+
+ \[`key`: `string`\]: `any`