Allowing using middleware config in dev server options

### Command

serve

### Description

Dev server middleware configuration is very commonly used in development，such as auto login or log printing，but it is not currently supported。

### Describe the solution you'd like

Refer to the implementation of proxyConfig, add the middlewareConfig configuration to angular.json -> server -> options, and parse and inject the middleware in angular/build.
middlewareConfig supports configuring a js file path, and the file exports a single middleware function or an array of multipe middleware functions. such as:
```
function log(req, res, next) {
next()
}

module.exports = log;
```

```
function log(req, res, next) {
next()
}

function auth(req, res, next) {
next()
}

module.exports =
[
log,
auth,
]
```

### Describe alternatives you've considered

_No response_

Start by tracing the serve command's dev-server options and the existing proxyConfig implementation, then inspect how angular.json server options are parsed and how angular/build injects development-server configuration. Done means middlewareConfig accepts a JavaScript file exporting one middleware function or an array, and the configured middleware runs in the dev server.

Scritto dal modello di indicizzazione a partire dal testo della issue.