Add ERC: Wallet Call Preparation API

[lukasrosario]

This proposal defines complementary JSON-RPC methods to EIP-5792's wallet_sendCalls. While wallet_sendCalls is used for an app to submit calls to be signed and submitted in a wallet's interface, the methods in this proposal are for an application to request prepared calls (where "prepared" depends on the wallet implementation) to be signed and submitted by the application itself.

[eip-review-bot]

✅ All reviewers have approved.

[github-actions[bot]]

The commit df076662477d791d75beed4197276722c4c15798 (as a parent of 139e8db0c3611a780027964a28a0586ab1ff9b99) contains errors. Please inspect the Run Summary for details.