metadata_hash canonical payload hashing spec

[nnennaokoye]

Summary

Receipt Contract: metadata_hash canonical payload hashing spec + verification helper

Linked issue

Closes #112

Changes

How to test

cargo test

Screenshots (if UI)

Checklist

• I linked an issue (or explained why one is not needed)
• I tested locally
• I did not commit secrets
• I updated docs if needed

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@nonso7's PR #1108 was approved and merged by @pope-h.

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@Nemenwq's PR #1291 was approved and merged by @pope-h.

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@Lynndabel's PR #1297 was approved and merged by @pope-h.

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@LawalRahman's PR #1462 was approved and merged by @pope-h.

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@nonso7's PR #1483 was approved and merged by @pope-h.

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@Nemenwq's PR #1479 was approved and merged by @pope-h.

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