### 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/instance.spec.js
});
    instance('/foo');
    getAjaxRequest().then(function (request) {
      expect(request.url).toBe('/foo');
      done();
    });
  });
  it('should make an http request', function (done) {
    const instance = axios.create();
    instance.get('/foo');
    getAjaxRequest().then(function (request) {
      expect(request.url).toBe('/foo');
      done();
    });
  });
  it('should use instance options', function (done) {
    const instance = axios.create({ timeout: 1000 });
    instance.get('/foo');
    getAjaxRequest().then(function (request) {
      expect(request.timeout).toBe(1000);
      done();
    });
  });
  it('should have defaults.headers', function () {
    const instance = axios.create({
      baseURL: 'https://api.example.com'
    });
    expect(typeof instance.defaults.headers, 'object');
    expect(typeof instance.defaults.headers.common, 'object');
  });