Create GenLayer client like viem examples

[AgustinRamiroDiaz]

Viem has examples for many clients in their public repo

• https://github.com/wevm/viem/blob/main/src/clients/createTestClient.ts
• https://github.com/wevm/viem/blob/main/src/clients/createWalletClient.ts
• https://github.com/wevm/viem/blob/main/src/clients/createPublicClient.ts

Which seem to compile without the as unknown patch that we do

https://github.com/yeagerai/genlayer-js/blob/95ae405ab75cb57200401588f373c04e3538a90f/src/client/client.ts#L21-L38

We should follow a similar approach so that we have better TypeScript usage