Add another way to get master token, implement uploading blobs to the server

[rukins]

Hey, thanks for your project!
I have created the similar library, but on Java.

And I wanna suggest some improvements for this python library:

1. Implement another way to get master token without deviceId. You just need an authentication token that can be obtained by logging in your Google account here. The description how to do it you can find on GitHub Page of gpsoath-java library. It is also my library.
   Server contract see here
2. Implement uploading blobs (for now only images). As far as i understand, in this library it is unavailable, only pulling images form the server.
   You can do it by making a request to https://notes-pa.googleapis.com/upload/notes/v1/media/
   See detailed all server endpoints here
3. And also here you can find all possible values for extraction status of image blob.

I am ready to help with any questions you have.

[kiwiz]

Thanks for the references! I'll take a look at this once I'm done with #130

[jakubklos77]

If this works then this seems to be the only way to make gkeepapi working again

[rukins]

I am not sure if it works now, but i can check and implement it

[rukins]

Using this method to get a master token works fine :)
I have updated the readme of the gpsoath-java library project to provide more detailed instructions

[jakubklos77]

Thank you @rukins. In that case this is the only working method now as the app password way does not work anymore (mentioned in other issues - even when using the docker image). @kiwiz Could you please take a look at this when you have time? Thank you

[kiwiz]

@jakubklos77 The PR to add this flow is here: simon-weber/gpsoauth#41

[jakubklos77]

@kiwiz You the man! Thank you

[kiwiz]

Closing in favor of #81. Splitting out blobs implementation into new issue.