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and doesn't generate any new files (indicating it might be out-of-date.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/FieldOptions.md

@@ -0,0 +1,27 @@
+[**@lancedb/lancedb**](../../../README.md) • **Docs**
+
+***
+
+[@lancedb/lancedb](../../../globals.md) / [embedding](../README.md) / FieldOptions
+
+# Interface: FieldOptions<T>
+
+## Type Parameters
+
+• **T** *extends* `DataType` = `DataType`
+
+## Properties
+
+### datatype
+
+```ts
+datatype: T;
+```
+
+***
+
+### dims?
+
+```ts
+optional dims: number;
+```