Transfer celestia to use grpc

[artemijspavlovs]

since celestia moved to use grpc as the protocol for interacting with consensus nodes,

the new config structure should be:

[DA]
  http_endpoint = "mocha.mzonder.com"
  grpc_port = 9090
  rpc_port = 26657 # use port 443 for https rpc endpoint
  state_nodes = [
     { http_endpoint = "mocha.artpav.dev", grpc_port = 9090, rpc_port = 26657 }
     { http_endpoint = "mocha.pavlabs.dev", grpc_port = 9090, rpc_port = 443 }
  ]

if the provided port is 443, there should be separate handling for https

roller config should be updated ( old DA section replaced with the new one ) as part of the roller da-light-client update command when the version to update to is > v0.21.5