wc-client: Secret Network support

[luca992]

Mobile Support Bounty
Implements APIs for the wc-client:

suggestToken
getSecret20ViewingKey
getSecret20ViewingKeyOrPermit
getEnigmaUtils
getEnigmaPubKey
getEnigmaTxEncryptionKey
enigmaEncrypt
enigmaDecrypt

Notes:

I implemented getSecret20ViewingKeyOrPermit like this:

As there is no permit functionality in keplr yet (that’s another bounty).
I’m not sure exactly what behavior you want when an error is thrown. But right now it will return an error instead of catching it and returning an object with both a null permit and a null viewing key

I also added getSecret20ViewingKeyOrPermit to the keplr interface and the all other provider implementations

Demo:

Screen.Recording.2023-05-22.at.6.37.02.PM.mov

Web App demo: the sample app from secretk

It shows the create viewing key message is being properly decrypted by keplr.

Screen.Recording.2023-05-23.at.8.17.58.PM.mov

For reference, this is what confirming a transaction looks like if keplr is not used for encryption (keplr cannot decrypt the message):

[eshelB]

Cool