Rust language server

This folder contains the deployment files for the Rust language server.

🚨 Warning: This language server is experimental. Please read about the caveats before enabling it. 🚨

You can enable it by:

Append the kubectl apply command for the Rust language server deployment to kubectl-apply-all.sh.

echo kubectl apply --prune -l deploy=xlang-rust -f configure/experimental/rust --recursive >> kubectl-apply-all.sh

Adding the following environment variables to the lsp-proxy deployment to make it aware of the Rust language server's existence.
```
# base/lsp-proxy/lsp-proxy.Deployment.yaml
env:
  - name: LANGSERVER_RUST
    value: tcp://xlang-rust:8080
```
Apply your changes to lsp-proxy and the Rust language server to the cluster.
```
./kubectl-apply-all.sh
```