Add `near-workspaces` tests to test/demo some of the examples

[dj8yfo]

Some of the examples are tested via only private interface, and not tested against a live sandbox node

• add tests/demonstration of example's logic via running in sandbox near_workspaces and contract's public interface
  • examples/adder/src/lib.rs
    • done in dj8yfo@bd7a8c8
  • examples/versioned/src/lib.rs
    • https://github.com/dj8yfo/near-sdk-rs/blob/b4b3dff0ef5a3f30841348a80461efc56f97945f/examples/versioned/src/lib.rs?plain=1#L166
  • examples/mission-control/src/mission_control.rs:102
    • https://github.com/dj8yfo/near-sdk-rs/blob/b4b3dff0ef5a3f30841348a80461efc56f97945f/examples/mission-control/src/mission_control.rs?plain=1#L120
  • examples/test-contract/src/lib.rs:50
    • https://github.com/dj8yfo/near-sdk-rs/blob/b4b3dff0ef5a3f30841348a80461efc56f97945f/examples/test-contract/src/lib.rs?plain=1#L68
  • examples/status-message/src/lib.rs:76
    • https://github.com/dj8yfo/near-sdk-rs/blob/b4b3dff0ef5a3f30841348a80461efc56f97945f/examples/status-message/src/lib.rs?plain=1#L94
  • examples/cross-contract-calls/high-level/src/lib.rs and examples/cross-contract-calls/low-level/src/lib.rs are missing a meaningful test too:

    #[cfg(all(test, not(target_arch = "wasm32")))]
    mod tests {
        #[tokio::test]
        async fn workspaces_test() -> anyhow::Result<()> {
            let wasm = near_workspaces::compile_project("./").await?;
            let worker = near_workspaces::sandbox().await?;
            let contract = worker.dev_deploy(&wasm).await?;
    
            // Call function a only to ensure it has correct behaviour
            let res = contract.call("factorial").args_json((5u32,)).max_gas().transact().await?;
            dbg!(&res);
            assert_eq!(res.json::<u32>()?, 120);
    
            Ok(())
        }
    }

Each individual example can be addressed separately via a separate pr.
This task can be picked up after #1253 is merged