feat: add support to fetch Braavos account

[glihm]

Proposal to add the current Braavos proxy class_hash as a supported accounts.

Braavos allows the user to export his private key, which makes it suitable for fecthing.

This PR considers for now that Braavos is using the OpenZeppelin config. May be changed later if they differ too much.

[milancermak]

I have code ready to do the same for Argent account v0.2.3. Will send a PR once this is merged.

[glihm]

I have code ready to do the same for Argent account v0.2.3. Will send a PR once this is merged.

How did you do to use Argent account as the private key is not extractable?
Or is it now?

[milancermak]

Wasn't it always the case?

Click the cog icon top-right, then the wallet name button on the top, and then you see a nice red "Export private key" button.

[glihm]

Wasn't it always the case?

Click the cog icon top-right, then the wallet name button on the top, and then you see a nice red "Export private key" button.

Wouarg sorry, totally my bad. Don't use it enough. Yup then it would be super nice having your PR. 👍

[milancermak]

[glihm]

Bump @xJonathanLEI. 😁

[dbejarano820]

I was just asking about this feature!

[xJonathanLEI]

Reusing OzAccountConfig is probably not a good idea. Oz and Braavos accounts are different as in one uses proxy and one does not. For the Braavos account we might also want to store the impl hash.

[xJonathanLEI]

Superseded by 331173c.