Feat/66/polka storage provider print start time of the provider

[cernicc]

Description

Implemented rpc client for the storage provider. The usage can be seen when calling info command. The client leverages the existing trait used for defining rpc methods.

How to test

Run rpc server: RUST_LOG=polka_storage_provider=trace cargo run --bin polka-storage-provider -- run --rpc-address ws://127.0.0.1:<parachain_node_port>
Execute cli info command: RUST_LOG=polka_storage_provider=trace cargo run --bin polka-storage-provider -- info

Checklist

• Are there important points that reviewers should know?
  • If yes, which ones?
• Make sure that you described what this change does.
• If there are follow-ups, have you created issues for them?
  • If yes, which ones? / List them here
• Have you tested this solution?
• Were there any alternative implementations considered?
• Did you document new (or modified) APIs?

[th7nder]

Looks good, could you provide some instructions in the PR how can I run it locally and test it?

[jmg-duarte]

I struggle to understand some decisions, comments would definitely help, though I still left some questions looking for some insight!

[jmg-duarte]

Great work! The API feels more natural now.

I've left some nitpicks and requests.

A quick note on them so you know where I'm coming from: after suffering a lot with Filecoin's lack of clarity and documentation, I believe we ought to be better and make code more readable without requiring you to already be a developer of the codebase. It helps anyone doing reviews as well as help onboard anyone that joins the project, saving everyone time in the process.

[jmg-duarte]

LGTM, great job!