Define type Serializable

[hugelgupf]

Toward lazy option parsing -- which I'm not 100% sure should be applied everywhere anymore, but at least should be applied to vendor options for ease of use of the library.

Bit of test coverage improvement here, too.

[codecov]

Codecov Report

Patch coverage: 87.30% and project coverage change: +0.01 🎉

Comparison is base (3e45eea) 72.88% compared to head (50801df) 72.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #495      +/-   ##
==========================================
+ Coverage   72.88%   72.90%   +0.01%     
==========================================
  Files          90       90              
  Lines        5728     5728              
==========================================
+ Hits         4175     4176       +1     
  Misses       1381     1381              
+ Partials      172      171       -1     

Impacted Files	Coverage Δ
dhcpv6/duid.go	84.61% <ø> (ø)
dhcpv6/types.go	91.66% <ø> (ø)
dhcpv6/dhcpv6message.go	78.75% <76.92%> (-0.06%)	⬇️
dhcpv6/dhcpv6relay.go	85.09% <82.35%> (-0.33%)	⬇️
dhcpv6/options.go	92.48% <83.33%> (-0.89%)	⬇️
dhcpv6/dhcpv6.go	77.31% <100.00%> (+3.59%)	⬆️
dhcpv6/option_iaaddress.go	92.50% <100.00%> (-0.53%)	⬇️
dhcpv6/option_iapd.go	94.00% <100.00%> (-0.34%)	⬇️
dhcpv6/option_iaprefix.go	94.64% <100.00%> (-0.19%)	⬇️
dhcpv6/option_nontemporaryaddress.go	94.54% <100.00%> (-0.29%)	⬇️
... and 3 more

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