Revert "Import ouroboros crate"

Revert submission 2428041-ouroboros-import

Reason for revert: b/271004059
Reverted changes: /q/submissionid:2428041-ouroboros-import

Change-Id: I344f89f148c0eb689afbfa217281f14724824ea6
11 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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