Remove name validation from codecs, match unions based on name rather than fullname

[bplommer]

No description provided.

[codecov-io]

Codecov Report

Merging #136 into master will decrease coverage by 0.55%.
The diff coverage is 97.82%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
- Coverage     100%   99.44%   -0.56%     
==========================================
  Files          15       15              
  Lines         737      726      -11     
  Branches       28       32       +4     
==========================================
- Hits          737      722      -15     
- Misses          0        4       +4

Impacted Files	Coverage Δ
modules/core/src/main/scala/vulcan/AvroError.scala	93.75% <0%> (-6.25%)	⬇️
modules/core/src/main/scala/vulcan/Codec.scala	100% <100%> (ø)	⬆️
...eneric/src/main/scala/vulcan/generic/package.scala	100% <100%> (ø)	⬆️

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[vlovgr]

Thanks @bplommer! 👍