chore: bring back previous interface of solana rpc

[zoruka]

Description

This PR brings back the previous signature field of the Solana's signTransaction response. It also brings the deserialization of the transaction in base64 as described in our RPC specs.

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[enesozturk]

@zoruka Let's follow our PR template for the next ones 🙏🏽

[enesozturk]

Oh sorry this is web-examples repo lol, ignore please. But maybe we could bring template to this repo as well