### Describe the bug

Module http adapter is not beind exported, so I cannot force axios to use the http adapter instead of xhr

### To Reproduce

```js
const axios =  require('axios');
const url = 'https://catfact.ninja/fact';
axios.get(url, {
  adapter: require('axios/lib/adapters/http'),
}).then(console.log).catch(console.log);
```
or 
```js
const instance = axios.create({
  adapter: require('axios/lib/adapters/http'),
})
```
It works using axios@0.27.2




### Expected behavior

Use HTTP adapter

### Axios Version

1.1.3 and 1.2.0-alpha.1

### Adapter Version

HTTP

### Browser

_No response_

### Browser Version

_No response_

### Node.js Version

19.0.0

### OS

_No response_

### Additional Library Versions

_No response_

### Additional context/Screenshots

_No response_
lib/adapters/http.js
proxy.auth = (proxy.username || '') + ':' + (proxy.password || '');
    }
    if (proxy.auth) {
      
      if (proxy.auth.username || proxy.auth.password) {
        proxy.auth = (proxy.auth.username || '') + ':' + (proxy.auth.password || '');
      }
      const base64 = Buffer
        .from(proxy.auth, 'utf8')
        .toString('base64');
      options.headers['Proxy-Authorization'] = 'Basic ' + base64;
    }
    options.headers.host = options.hostname + (options.port ? ':' + options.port : '');
    const proxyHost = proxy.hostname || proxy.host;
    options.hostname = proxyHost;
    
    options.host = proxyHost;
    options.port = proxy.port;
    options.path = location;
    if (proxy.protocol) {
      options.protocol = proxy.protocol.includes(':') ? proxy.protocol : `${proxy.protocol}:`;
    }
  }
  options.beforeRedirects.proxy = function beforeRedirect(redirectOptions) {
    
    
    setProxy(redirectOptions, configProxy, redirectOptions.href);
  };
}
export default function httpAdapter(config) {