feat: add zilliqa schnorr signing (again)

[feri42]

Cherry picked #185 from master, to be released without the post 7.4 upgrades.

[feri42]

How can I release a version of keychain from the [keychain-7.4.x](https://github.com/ExodusMovement/exodus-oss/tree/keychain-7.4.x) branch?

[kewde]

@feri42 try manually releasing it

yarn
cd features/keychain
npm publish

[feri42]

@feri42 try manually releasing it

Doesn't work out-of-the-box:

npm error code E404
npm error 404 Not Found - PUT https://registry.npmjs.org/@exodus%2fkeychain - Not found
npm error 404
npm error 404  '@exodus/[email protected]' is not in this registry.

[sparten11740]

@mvayngrib you are admin in this repo right? could you protect the branch keychain-7.4.x with the default ruleset, so we can publish from it?

[feri42]

I switched to the existing @exodus/keychain-7.4 branch. And was able to publish 7.4.3 using the github 'Publish' workflow.

[feri42]

Also, I've deleted keychain-7.4.x