Ignore type name domain when serializing Any

[damszew]

During my original PR #145 , I've only addressed deserializing part. In this PR, I'm aligning serializing, so that it behaves the same way.

[codecov]

Codecov Report

Attention: Patch coverage is 85.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.75%. Comparing base (c91072d) to head (fd18abc).

Files with missing lines	Patch %	Lines
prost-reflect/src/dynamic/serde/ser/wkt.rs	85.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #148      +/-   ##
==========================================
+ Coverage   79.67%   79.75%   +0.08%     
==========================================
  Files          31       31              
  Lines        5244     5241       -3     
==========================================
+ Hits         4178     4180       +2     
+ Misses       1066     1061       -5     

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