chore: Cbindings allow mounting the Store protocol from libwaku

[Ivansete-status]

Description

Allows to mount Store in the node started from libwaku. With that PR, the node can receive the following configuration items as a parameter:

{
      "store": 1,
      "storeDbUrl": "postgres://postgres:test123@localhost:5432/postgres",
      "storeRetentionPolicy": "time:6000000",
      "storeMaxNumDbConnections": 30
}

In upcoming PRs, we will introduce pending changes to allow the "self" node to make requests to other Store nodes, and we will introduce an additional API function for that: waku_store_query(char* queryJSON, char* peerID, int ms, WakuCallBack cb, void* userData);

Note: ignore the library/waku_thread/inter_thread_communication/requests/protocols/store_request.nim for now. It will be completed shortly.

Changes

• Allow mount Store protocol from libwaku-cbindings
• Extend the C example to mount Store in the "self" node.
• Move the WakuCallBack definition in a separate file, library/callback.nim

[github-actions]

You can find the image built from this PR at

quay.io/wakuorg/nwaku-pr:2276

Built from f96c218

[jm-clius]

Thanks! :)