adding displayOptions config

[jchesterman]

This PR introduces the displayOptions that's already available on the embedded Explorer in order to allow for a pre-collapsed docs panel on initial load with Sandbox.

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Latest commit: 494ef9e

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Sandbox	Source
maya-test-embed-next	Configuration
maya-test-embed-next	Configuration

[KrenTrox]

Why not adding the rest?
I think that it would be a good idea https://github.com/apollographql/embeddable-explorer/blob/main/packages/explorer/src/EmbeddedExplorer.ts#L17