feat: Add sagemaker endpoint support

[cmanou]

• Kept it as close to the python implementation as possible
• I have not implemented the credentials_profile_name arg, given the changes with the new aws-sdk v3 I am wondering if we should just allow passing in the full credential arg so people can use whatever aws credential provider they want.
• I don't know how the integration test should work given it would need a sagemaker endpoint, this looks like it was also an issue for the python implementation as it is also missing the tests.

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Name	Status	Preview	Updated (UTC)
langchainjs-docs	✅ Ready (Inspect)	Visit Preview	May 18, 2023 11:52am

[jacoblee93]

This looks really cool!

Could you add an integration test to demonstrate how to set up and use this? A comment with some details about how to set it up would be fine - we should expand it to a docs page later.

[cmanou]

@jacoblee93 have added the docs and integration test albeit skipped due to the need for a sagemaker endpoint that's accessible for ci to test.

[jacoblee93]

@jacoblee93 have added the docs and integration test albeit skipped due to the need for a sagemaker endpoint that's accessible for ci to test.

Thanks! Made a few modifications:

1. You don't need to skip the integration tests as they don't run as part of CI right now.
2. We don't need to do the await import syntax anymore - just import it, make sure it's under a separate entrypoint, and add it under requiresOptionalDependency in langchain/scripts/create-entrypoints.js: https://github.com/hwchase17/langchainjs/pull/1267/files#diff-d541783a759c4660823be9d9adc2406939edbc517f876c28b18136abd4db6f86R160
3. We try to put all docs code examples in the examples/ folder now so our linter and formatter can run on them.

Also moved a few args and types around - worked great overall with HuggingFace GPT-2 for me. Thank you!

[cmanou]

@jacoblee93 thanks for making those changes. Is there anything else needed to get this over the line ?