Add NTPv5 support to Peer

[tdittr]

• Add a state machine for protocol upgrades to the peer

[codecov]

Codecov Report

Attention: 36 lines in your changes are missing coverage. Please review.

Comparison is base (fa80494) 85.52% compared to head (0a4bcb5) 85.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1168      +/-   ##
==========================================
+ Coverage   85.52%   85.60%   +0.07%     
==========================================
  Files          57       57              
  Lines       15699    15883     +184     
==========================================
+ Hits        13427    13597     +170     
- Misses       2272     2286      +14     

Files	Coverage Δ
ntp-proto/src/packet/extension_fields.rs	93.41% <100.00%> (+0.06%)	⬆️
ntp-proto/src/packet/v5/mod.rs	90.38% <100.00%> (ø)
ntp-proto/src/time_types.rs	94.25% <100.00%> (+0.06%)	⬆️
ntp-proto/src/packet/mod.rs	85.91% <81.63%> (+0.90%)	⬆️
ntp-proto/src/peer.rs	88.55% <81.37%> (-1.62%)	⬇️

... and 1 file with indirect coverage changes

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