### Describe the bug

libraries like axios-mock-adapter define an adapter but in same cases need to access to original adapter.

It was working correctly before as the adapter was always a function.
Now it can be an array of string

Only the method getAdapter() in adapters/adapter.js can allow access to original adapters (xhr and http)
But this method is not exported a all at top level.

Can you export it ? 


### To Reproduce

Try to use axios-mock-adapter plugin with onNoMatch option

### Code snippet

_No response_

### Expected behavior

_No response_

### Axios Version

1.2.1 and upper

### Adapter Version

_No response_

### Browser

_No response_

### Browser Version

_No response_

### Node.js Version

_No response_

### OS

_No response_

### Additional Library Versions

_No response_

### Additional context/Screenshots

_No response_
test/module/typings/esm/index.ts
});
axios.toFormData({x: 1}, new FormData());
toFormData({x: 1}, new FormData());
axios.toFormData(new FormData());
formToJSON(new FormData());
axios.get('/user', {signal: new AbortController().signal});
axios.get('/user', {
  transformRequest: [
    (data: any, headers) => {
      headers.setContentType('text/plain');
      return 'baz';
    },
    (data: any, headers) => {
      headers['foo'] = 'bar';
      return 'baz'
    }
  ],
  transformResponse: [(data: any, headers: AxiosResponseHeaders) => {
    headers.has('foo');
  }]
});
axios.get('/user', {
  headers: new AxiosHeaders({x:1})
});
axios.get('/user', {
  headers: {
    foo : 1
  }
});
function getRequestConfig1(options: AxiosRequestConfig): AxiosRequestConfig {