Code examples on how to use Rust SDK with each supported building block

Consider adding examples in the Github repo (maybe as a README?) on how to use the Rust SDK for each of the supported Building Blocks, e.g how to use the Rust SDK for Service Invocation.

These examples will provide clarity on how to use the SDK. Additionally, we can raise visibility into the SDK by linking to the examples from each Building Block overview page.

Start by reviewing the Rust SDK repository and identifying the supported Building Blocks, then inspect existing SDK usage and the relevant Building Block overview pages. Add usage examples, possibly in a README, for each supported Building Block and link to them from the overview pages; done means every supported Building Block has a clear Rust example.

Written by the indexing model from the issue text.