[DO NOT MERGE] Smart Escrows

[mvadari]

High Level Overview of Change

Adds xrpl.js support for Smart Escrows.

Also reorganizes the Escrow integration tests into one file.

Context of Change

XRPLF/XRPL-Standards#270

Type of Change

• New feature (non-breaking change which adds functionality)

Did you update CHANGELOG.md?

• Yes
• No, this change does not impact library users

Test Plan

Added some basic tests

Integration tests expected to fail right now, since this is a new feature.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch smart-escrows

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