Avoid intermediate string creation in fallback when printing distribution names

[devmotion]

See #2050 (comment)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 61.11111% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.46%. Comparing base (196d79b) to head (2111c8d).

Files with missing lines	Patch %	Lines
src/multivariate/mvnormalcanon.jl	0.00%	6 Missing ⚠️
src/multivariate/mvnormal.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2051   +/-   ##
=======================================
  Coverage   86.46%   86.46%           
=======================================
  Files         147      147           
  Lines        8837     8837           
=======================================
  Hits         7641     7641           
  Misses       1196     1196           

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[bvdmitri]

This change is breaking and removes the function that is quite useful, why not keep the original function for backward compatibility? The new implementation can simply create IOBuffer, write to it, and return a string from there.

[devmotion]

This is an internal function, so the change is not breaking.

[bvdmitri]

This is a useful function that can be made public and documented, why not?

[devmotion]

Why should it be made public? There's already string, repo, nameof etc., IMO there's no motivation for this function apart from being used in a few internal implementations.