Add Buck2 build

[aaronmondal]

Description

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Fixes # (issue)

Type of change

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• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

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Checklist

• [ ] Updated documentation if needed
• [ ] Tests added/amended
• [x] bazel test //... passes locally
• [x] PR is contained in a single commit, using git amend see some docs

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This change is