Add export of FakeResponseType and PerftoolComponent

[saranchonkau]

Is your feature request related to a problem? Please describe.
I'm trying to write perf test but TS throws error

import { intercept } from '@salutejs/perftool';
// long non-standard import
import type { PerftoolComponent } from '@salutejs/perftool/dist/client/measurement/runner'; 

export const Default: PerftoolComponent = () => {
  return <div></div>;
};

Default.beforeTest = async () => {
  await intercept({
    method: 'GET',
    responseType: 'file', // TS2322: Type "file" is not assignable to type FakeResponseType | undefined
    source: '**/some.client.js',
    response: 'public/js/some.client.js',
  });
};

I tried to use FakeResponseType directly, but its value is not exported from the package...
I can write something like this, but it looks like workaround but not as intended.

import type { FakeResponseType } from '@salutejs/perftool/dist/api/intercept';
...
await intercept({
    method: 'GET',
    responseType: 'file' as FakeResponseType.File,
    source: '**/some.client.js',
    response: 'public/js/some.client.js',
});

Describe the solution you'd like
Would be great if you add export of FakeResponseType object and type PerftoolComponent, so I will be able to just import them as usual:

import { PerftoolComponent, FakeResponseType } from '@salutejs/perftool';

Describe alternatives you've considered
Or you may allow to pass common strings 'file' | 'json' | 'abort' instead of const enum

[akhdrv]

Const enums were a bad idea, it's a known issue. Now string literals will be used instead