Add Chroma Cloud config

[kylediaz]

Why are these changes needed?

Hi it's Kyle from the Chroma team 👋 We're going to be launching hosted Chroma very soon, so we want to make sure that all autogen users can easily use it.

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• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[kylediaz]

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[kylediaz]

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