previously the `registry` would return `undefined | EmbeddingFunction`
even for built in functions such as "openai"
now it'll return the correct type for `getRegistry().get("openai")
as well as pass in the correct options type to `create`
### before
```ts
const options: {model: 'not-a-real-model'}
// this'd compile just fine, but result in runtime error
const openai: EmbeddingFunction | undefined = getRegistry().get("openai").create(options)
// this'd also compile fine
const openai: EmbeddingFunction | undefined = getRegistry().get("openai").create({MODEL: ''})
```
### after
```ts
const options: {model: 'not-a-real-model'}
const openai: OpenAIEmbeddingFunction = getRegistry().get("openai").create(options)
// Type '"not-a-real-model"' is not assignable to type '"text-embedding-ada-002" | "text-embedding-3-large" | "text-embedding-3-small" | undefined'
```
while adding some more docs & examples for the new js sdk, i ran across
a few compatibility issues when using different arrow versions. This
should fix those issues.
