[draft] add support for arbitrary media types

[tom-vx51]

What changes are proposed in this pull request?

Currently, all datasets must have media types that are natively supported by FiftyOne (image, video, point-cloud, 3d), or groups of such media types. This PR adds support to the SDK and app for arbitrary media types.

ds = fo.Dataset()

# previously an error, now this is allowed
sample = fo.Sample(filepath="/path/to/file.csv", media_type="csv")

ds.add_sample(sample)
print(ds.media_type)
# csv

Samples with non-native media types are rendered with relevant metadata in the grid.

How is this patch tested? If it is not, please explain why.

unit tests, local app

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release
  notes for FiftyOne users.

(Details in 1-2 sentences. You can just refer to another PR with a description
if this PR is part of a larger change.)

Add support for creating samples with arbitrary media_type.

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

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Review skipped

Ignore keyword(s) in the title.

⛔ Ignored keywords (3)

• WIP
• DO NOT MERGE
• DRAFT

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[sashankaryal]

👑

[brimoor]

Can we please not merge this into develop until we're sure the SDK is fully wired up to support custom media types in a way we're comfortable with? And we have documentation for it, etc.

[brimoor]

@tom-vx51 I was playing with this tonight and noticed that the 3D visualizer is not appearing as expected on this branch, both for "flat" 3D datasets and grouped datasets that contain 3D slices:

import fiftyone as fo
import fiftyone.zoo as foz

session = fo.launch_app()

session.dataset = foz.load_zoo_dataset("quickstart-3d")

session.dataset = foz.load_zoo_dataset("quickstart-groups")

Can you take a look?