remove @celo/rpc-wallet (#342)

### Description

As described[ in this form
post](https://forum.celo.org/t/deprecation-of-celo-wallet-rpc/8452) the
@celo/wallet-rpc package is being removed. `personal_` namespace is
deprecated in geth. and already not supported in testing environments
like anvil.

### Other changes

nope

### Tested

n/a
### Related issues

- Fixes #257 
- fixes celo-org/celo-blockchain-planning#431

### Backwards compatibility

nope
### Documentation

docs updated

<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on the deletion of various files and directories related
to the `wallet-rpc` module in the SDK, indicating a significant removal
of components from the project.

### Detailed summary
- Deleted the entire `docs/sdk/wallet-rpc` directory, including
`README.md` and multiple module documentation files.
- Removed the `wallet-rpc` directory from `packages/sdk/wallets`,
including its `README.md`, configuration files, and source files.
- Eliminated test utility files related to `ganache` in
`src/test-utils`.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your
question}`

<!-- end pr-codex -->

README.md

@@ -47,7 +47,6 @@ This repository contains source code for:
   - [`@celo/wallet-ledger`](https://www.npmjs.com/package/@celo/wallet-ledger)
   - [`@celo/wallet-local`](https://www.npmjs.com/package/@celo/wallet-local)
   - [`@celo/wallet-remote`](https://www.npmjs.com/package/@celo/wallet-remote)
-  - [`@celo/wallet-rpc`](https://www.npmjs.com/package/@celo/wallet-rpc)
 
 ## Contributing