fix(node): support specifying arrow field types by name (#2704)

The [`FieldLike` type in
arrow.ts](https://github.com/lancedb/lancedb/blob/5ec12c99713e28a8fa550547cc9e7536da063f6e/nodejs/lancedb/arrow.ts#L71-L78)
can have a `type: string` property, but before this change, actually
trying to create a table that has a schema that specifies field types by
name results in an error:

```
Error: Expected a Type but object was null/undefined
```

This change adds support for mapping some type name strings to arrow
`DataType`s, so that passing `FieldLike`s with a `type: string` property
to `sanitizeField` does not throw an error.

The type names that can be passed are upper/lowercase variations of the
keys of the `constructorsByTypeName` object. This does not support
mapping types that need parameters, such as timestamps which need
timezones.

With this, it is possible to create empty tables from `SchemaLike`
objects without instantiating arrow types, e.g.:

```
    import { SchemaLike } from "../lancedb/arrow"
    // ...
    const schemaLike = {
      fields: [
        {
          name: "id",
          type: "int64",
          nullable: true,
        },
        {
          name: "vector",
          type: "float64",
          nullable: true,
        },
      ],
    // ...
    } satisfies SchemaLike;
    const table = await con.createEmptyTable("test", schemaLike);
 ```

This change also makes `FieldLike.nullable` required since the `sanitizeField` function throws if it is undefined.

nodejs/lancedb/arrow.ts

@@ -73,7 +73,7 @@ export type FieldLike =
   | {
       type: string;
       name: string;
-      nullable?: boolean;
+      nullable: boolean;
       metadata?: Map<string, string>;
     };