Sign typed data using BrowserSigner

[DanielSchiavini]

Closes #128
Depends on #124

What I did

Allow signing typed data using BrowserSigner

How I did it

• Created the sign_typed_data method in the BrowserSigner.
• Created the signTypedData front-end callback
• Added a test

How to verify it

Try in a notebook:

!pip install git+https://github.com/DanielSchiavini/titanoboa.git@128/sign-typed-data
from boa.integrations.jupyter import BrowserSigner
BrowserSigner().sign_typed_data(....)

Description for the changelog

Allow signing typed data in JupyterLab/Colab using BrowserSigner

Cute Animal Picture

[charles-cooper]

from a UX perspective, it might be nice to have a browser_signer property on the NetworkEnv (which throws an error if the rpc is not a BrowserRPC).

[DanielSchiavini]

@charles-cooper your comment is fixed in #131
There are no changes necessary in this branch, so I did not merge it here yet