Adding rest_api crate and exposing take orders functionality

[findolor]

Chained PR

• Implement preflight simulation logic for take orders functionality in the SDK #2363

Motivation

See issues:

• Take Orders SDK Functionality #2353
• Create a rest API and expose take orders functionality #2364

Solution

• Add a new crate for the rest API logic
• Add a single route for take orders
• Add tests

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)

fix #2364

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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 2025-12-18-orderbook-api

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