[WIP] Add fo.SampleReference as a way to reference other samples in other datasets

[jnewb1]

What changes are proposed in this pull request?

I created a rough proof of concept for my SampleReference idea proposed here. If the general idea is accepted, I will continue to improve and cleanup the PR.
#5275

Some initial benchmarks in sample_reference_benchmark.py, with a large polyline base dataset

-- copy --
create: 31.23691725730896s
26137484 bytes
load: 7.902476072311401s
-- reference --
create: 26.170767784118652s
16560609 bytes
load: 13.691819429397583s

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

Added a basic test case confirming basic functionality. I will add more tests to catch other edge cases.

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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Ignore keyword(s) in the title.

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• WIP
• DO NOT MERGE
• DRAFT

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