airframe-msgpack: #1159 Support packTimestamp(unixtime)

[xerial]

To force using timestamp32 wherever possible

[Codecov]

Codecov Report

Merging #1160 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1160   +/-   ##
=======================================
  Coverage   82.49%   82.50%           
=======================================
  Files         277      277           
  Lines       10680    10680           
  Branches      695      695           
=======================================
+ Hits         8810     8811    +1     
+ Misses       1870     1869    -1     

Impacted Files	Coverage Δ
...scala/wvlet/airframe/msgpack/impl/PackerImpl.scala	0.00% <ø> (ø)
...main/scala/wvlet/airframe/msgpack/spi/Packer.scala	50.00% <ø> (ø)
...irframe/src/main/scala/wvlet/airframe/Binder.scala	69.04% <0.00%> (+2.38%)	⬆️

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