cardano-ping trace log changes

[coot]

• cardano-ping: printing of negotiated version
• cardano-ping: formatting of StatPoint
• cardano-ping: updated CHANGELOG.md file

[coot]

cardano-cli ping -h $(resolvectl query --raw coot.me -4 | awk '{print $2}') -p 7776 -c 5            
95.217.1.58:7776 network rtt: 0.062
95.217.1.58:7776 handshake rtt: 0.067647887s
95.217.1.58:7776 Negotiated version NodeToNodeVersionV11 764824073 InitiatorOnly
timestamp,                      host,                         cookie,  sample,  median,     p90,    mean,     min,     max,     std
2023-06-12T08:37:28.205318946Z, 95.217.1.58:7776,                  0,   0.069,   0.069,   0.069,   0.069,   0.069,   0.069,     NaN
2023-06-12T08:37:29.265466863Z, 95.217.1.58:7776,                  1,   0.059,   0.064,   0.068,   0.064,   0.059,   0.069,   0.007
2023-06-12T08:37:30.328873883Z, 95.217.1.58:7776,                  2,   0.062,   0.063,   0.068,   0.063,   0.059,   0.069,   0.005
2023-06-12T08:37:31.390815961Z, 95.217.1.58:7776,                  3,   0.061,   0.061,   0.068,   0.063,   0.059,   0.069,   0.004
2023-06-12T08:37:32.451068867Z, 95.217.1.58:7776,                  4,   0.059,   0.061,   0.067,   0.062,   0.059,   0.069,   0.004

cardano-cli ping -h $(resolvectl query --raw coot.me -4 | awk '{print $2}') -p 7776 --query-versions
95.217.1.58:7776 network rtt: 0.064
95.217.1.58:7776 handshake rtt: 0.064010896s
95.217.1.58:7776 Queried versions [NodeToNodeVersionV11 764824073 InitiatorAndResponder,NodeToNodeVersionV10 764824073 InitiatorAndResponder,NodeToNodeVersionV9 764824073 Initiat
orAndResponder,NodeToNodeVersionV8 764824073 InitiatorAndResponder,NodeToNodeVersionV7 764824073 InitiatorAndResponder]

When querying an older node which doesn't support --query-versions, the negotiated version is printed:

34.245.250.174:3001 network rtt: 0.045
34.245.250.174:3001 handshake rtt: 0.101867615s
34.245.250.174:3001 Negotiated version NodeToNodeVersionV10 764824073 InitiatorAndResponder