feat: add criterion bench for RouteProvider implementations

[nikolay-komarevskiy]

Description

Add Rust criterion benchmarks for the three implementation of RouteProviders. Run the benchmarks with this command:

agent-rs/ic-agent $ cargo bench --bench perf_route_provider --features bench

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

Checklist:

• [ ] The title of this PR complies with Conventional Commits.
• [ ] I have edited the CHANGELOG accordingly.
• [ ] I have made corresponding changes to the documentation.