Rust is Unsupported runtime?

## Bug Report

After running `sls offline start` command, I try to access the API gateway by accessing: http://localhost:3000/dev/health, and then I get an HTTP error 502, while in the terminal I see that sls offline start doesn't support rust. Any idea how to fix it? Because I really want to work with rust and I don't want to deploy my lambda function each time in order to access the API gateway (yes when I deploy it, it works).

**Current Behavior**

```
Server ready: http://localhost:3000 🚀

Enter "rp" to replay the last request

GET /dev/health (λ: base_http)

Warning: Warning: found unsupported runtime 'rust' for function 'base_http'
✖ Unsupported runtime
✖ Error: Unsupported runtime
at HandlerRunner._loadRunner (/usr/lib/node_modules/serverless-offline/dist/lambda/handler-runner/HandlerRunner.js:177:11)
at HandlerRunner.run (/usr/lib/node_modules/serverless-offline/dist/lambda/handler-runner/HandlerRunner.js:215:72)
at LambdaFunction.runHandler (/usr/lib/node_modules/serverless-offline/dist/lambda/LambdaFunction.js:369:92)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async hapiHandler (/usr/lib/node_modules/serverless-offline/dist/events/http/HttpServer.js:740:18)
at async exports.Manager.execute (/usr/lib/node_modules/serverless-offline/node_modules/@hapi/hapi/lib/toolkit.js:60:28)
at async Object.internals.handler (/usr/lib/node_modules/serverless-offline/node_modules/@hapi/hapi/lib/handler.js:46:20)
at async exports.execute (/usr/lib/node_modules/serverless-offline/node_modules/@hapi/hapi/lib/handler.js:31:20)
at async Request._lifecycle (/usr/lib/node_modules/serverless-offline/node_modules/@hapi/hapi/lib/request.js:371:32)
at async Request._execute (/usr/lib/node_modules/serverless-offline/node_modules/@hapi/hapi/lib/request.js:281:9)
```

**Sample Code**

- file: serverless.yml

```yaml
service: my-service

frameworkVersion: "3"

plugins:
- serverless-rust
- serverless-offline

provider:
runtime: rust
stage: dev

package:
individually: true

custom:
rust:
dockerless: true

functions:
base_http:
handler: base_http
events:
- http:
method: get
path: health
```

- file: main.rs

```rust
use lambda_http::{service_fn, Error, IntoResponse, Request, RequestExt};

#[tokio::main]
async fn main() -> Result<(), Error> {
lambda_http::run(service_fn(hello)).await?;
Ok(())
}

async fn hello(request: Request) -> Result {
let _context = request.lambda_context();

Ok(format!(
"hello {}",
request
.query_string_parameters()
.first("name")
.unwrap_or_else(|| "stranger")
))
}

```

**Environment**

- `serverless` version: 6.2.2
- `serverless-offline` version: 8.8.0
- `node.js` version: v16.13.2
- `npm` version: 8.5.5
- `OS`: Windows 10, Running on WSL (Ubuntu 20.04).
- `rustc` version: rustc 1.61.0 (fe5b13d68 2022-05-18)