Allow chaining with `Authenticator#use`

[lifeiscontent]

this change allows for chaining to happen while resolving the proper type.

example:

previously:

export const authenticator = new Authenticator<SessionData["user"]>(
  sessionStorage,
  {
    sessionKey,
  }
);

authenticator.use(auth0Strategy);

now:

export const authenticator = new Authenticator<SessionData["user"]>(
  sessionStorage,
  {
    sessionKey,
  }
).use(auth0Strategy); // previously doing this would result in a type error due to user resolving to `unknown`

[lifeiscontent]

@sergiodxa when will these changes be released?