Add subcommand for accessing network information like latest ledger

[willemneal]

Should we expand this to add an rpc subcommand to make it easier to access all RPC methods?

[leighmcculloch]

Should we expand this to add an rpc subcommand to make it easier to access all RPC methods?

+1 This would probably be helpful. I don't think that would necessarily replace this issue, but separate to it.

There's an open issue discussing the possibility of the RPC serving up a HTTP JSON interface so that it is easier to curl:

• https://github.com/stellar/soroban-rpc/issues/188