feat: add ability to extend "hermione" global variable

[DudaGod]

Usage example

• Extend interface GlobalHelper from module "hermione":

  
  // global.d.ts
  import type { GlobalHelper } from "hermione";

declare module "hermione" { interface GlobalHelper { also: { in: (args: string | string[]) => void; }; } }

- Use `hermione.also.in` with extended typings:
```ts
hermione.also.in('foo');