feat!: use _.canister.name built-in instead of explicit package param (Rust recipe)

[marc0olo]

Summary

• Drops the package configuration parameter from the Rust recipe — the canister name is now injected automatically via {{_.canister.name}}
• The Cargo package name in Cargo.toml must match the canister name in icp.yaml — this was already the implicit convention, now it's the enforced one
• Mirrors the same change made to the Motoko recipe in feat!: rewrite Motoko recipe to delegate compilation to mops build #26

Breaking change

Remove package: from recipe configuration and ensure the canister name in icp.yaml matches [package].name in Cargo.toml:

# before
canisters:
  - name: backend
    recipe:
      type: "@dfinity/rust@<version>"
      configuration:
        package: backend

# after
canisters:
  - name: backend
    recipe:
      type: "@dfinity/rust@<version>"

Blocked on

dfinity/icp-cli#567 — provides {{_.canister.name}} built-in variable

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