feat: make package param optional, use canister name as default (Rust recipe)

[marc0olo]

Summary

• Makes package an optional parameter — when omitted, the canister name from icp.yaml is used automatically via {{_.canister.name}}
• Non-breaking: existing configs with package: continue to work unchanged
• package is useful when the Cargo package name differs from the canister name (e.g. in a workspace)

Convention

By default, name the canister in icp.yaml to match [package].name in Cargo.toml — no configuration needed:

canisters:
  - name: backend       # must match [package].name in Cargo.toml
    recipe:
      type: "@dfinity/rust@<version>"

Use package only when the names genuinely differ (e.g. workspace):

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

Blocked on

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

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