Add more documentation on input arguments

[ShekharNarayanan]

Hi, thanks for creating this awesome tool. One thing I realized while using at the OAuth2Component method is that I cannot pass input arguments with specified labels. Here is what I mean:

Your example:

o2c = OAuth2Component(CLIENT_ID, 
  CLIENT_SECRET, 
  AUTHORIZE_URL, 
  TOKEN_URL,
  REFRESH_TOKEN_URL, 
  REVOKE_TOKEN_URL)

Here, ideally a user should also be able to enter the input arguments in whatever order they wish to using input labels. This is what I mean:

o2c = OAuth2Component(client_id = CLIENT_ID, 
  client_secret = CLIENT_SECRET, 
  authorize_url = AUTHORIZE_URL, 
  token_url = TOKEN_URL,
  refresh_token_url = REFRESH_TOKEN_URL, 
  revoke_token_url = REVOKE_TOKEN_URL)

This will also make writing wrappers around the OAuth2Component method more easy and definitely helps when using Pages in streamlit. Could you add this functionality? Let me know if I have missed something! Cheers!