Brings maliput_malidrive to maliput-sdk

[francocipollone]

🎉 New feature

Goes on top of #6 Related to #2

Summary

• maliput-sdk

  • Vendors maliput_malidrive via maliput-sdk

    • The idea is to bring it via BCR (similarly to maliput) however
    • as it hasn't been released in the BCR yet submodules were used. (https://github.com/bazelbuild/bazel-central-registry/pull/1269)
    • as there is a pending modification in the plugin target in maliput_malidrive (https://github.com/maliput/maliput_malidrive/pull/269)

  • Adds executable to get the path of the road network plugin .so file.

• maliput-sys
  • Adds MALIPUT_PLUGIN_PATH env var in the build rs so it remains for every executable and test in the crate.
• Provide documentation to run example

Test it

Read README

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [x] Added example and/or tutorial
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if it affects the public API)