### 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/specs/api.spec.js
expect(typeof axios.head).toEqual('function');
    expect(typeof axios.options).toEqual('function');
    expect(typeof axios.delete).toEqual('function');
    expect(typeof axios.post).toEqual('function');
    expect(typeof axios.put).toEqual('function');
    expect(typeof axios.patch).toEqual('function');
  });
  it('should have promise method helpers', function () {
    const promise = axios('/test');
    expect(typeof promise.then).toEqual('function');
    expect(typeof promise.catch).toEqual('function');
  });
  it('should have defaults', function () {
    expect(typeof axios.defaults).toEqual('object');
    expect(typeof axios.defaults.headers).toEqual('object');
  });
  it('should have interceptors', function () {
    expect(typeof axios.interceptors.request).toEqual('object');
    expect(typeof axios.interceptors.response).toEqual('object');
  });
  it('should have all/spread helpers', function () {
    expect(typeof axios.all).toEqual('function');
    expect(typeof axios.spread).toEqual('function');
  });
  it('should have factory method', function () {
    expect(typeof axios.create).toEqual('function');
  });
  it('should have CanceledError, CancelToken, and isCancel properties', function () {
    expect(typeof axios.Cancel).toEqual('function');
    expect(typeof axios.CancelToken).toEqual('function');