Extend restatectl with basic log and node operations

[pcholakov]

Related tssue: https://github.com/restatedev/restate/issues/1777

This change so far adds the following new subcommands:

restatectl logs list displays all the logs and their tail segment:

❯ restatectl logs list | head
 LOG-ID  SEGMENTS  TAIL BASE LSN  KIND  
 0       1         1              Local 
 1       1         1              Local 
 2       1         1              Local 
 3       1         1              Local 
 4       1         1              Local 
 5       1         1              Local 
 6       1         1              Local 
 7       1         1              Local 
 8       1         1              Local 

restatectl logs describe list the segments of a particular log

It prints the list of sealed segments and the latest offset from the tail segment:

❯ restatectl logs describe --log-id 1
 SEGMENT  STATE  BASE LSN  TAIL LSN  KIND  
 0        OPEN   1         33        Local 

restatectl nodes list lists the known nodes

Very basic right now, only extracting information from the ClusterState struct without introducing a new operation / consulting NodesConfiguration yet:

❯ restatectl nodes list
 NODE  LEADER  FOLLOWER  UNKNOWN  LAST REFRESH
 N0    24      0         0        810 ms ago