feat(ledger-browser): show fabric network structure

[outSH]

Is your feature request related to a problem? Please describe.

Fabric Browser app of ledger-browser should display the overview of the components of current ledger network (peers, orderers, chaincode, etc..). It is not meant to be an operation console but a quick overview of how current channel operates.

Describe the solution you'd like
This is a multi-step issue (sub tasks will be created if issue is assigned).

• Investigate how to efficiently gather information on network structure.
  • Use discovery service? https://hyperledger.github.io/fabric-sdk-node/main/tutorial-discovery-fabric-network.html
  • Contact fabric folks for advice.
• Implement a method on fabric-connector that will return the network structure in JSON format.
• Extend persistence fabric plugin to fetch this data and store it into the database.
• Add new view to Fabric Browser app that will display the network structure (simple format is preferred for this initial implementation, it can be improved in the future. List of components should be enough).