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and doesn't generate any new files (indicating it might be out-of-date.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

@@ -0,0 +1,22 @@
+[**@lancedb/lancedb**](../README.md) • **Docs**
+
+***
+
+[@lancedb/lancedb](../globals.md) / FullTextSearchOptions
+
+# Interface: FullTextSearchOptions
+
+Options that control the behavior of a full text search
+
+## Properties
+
+### columns?
+
+```ts
+optional columns: string | string[];
+```
+
+The columns to search
+
+If not specified, all indexed columns will be searched.
+For now, only one column can be searched.