Auto-detect external profilers.

[maleadt]

Closes #2176

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 71.92%. Comparing base (4ba6321) to head (324e525).

Files	Patch %	Lines
src/profile.jl	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2339      +/-   ##
==========================================
- Coverage   71.96%   71.92%   -0.05%     
==========================================
  Files         155      155              
  Lines       15080    15093      +13     
==========================================
+ Hits        10852    10855       +3     
- Misses       4228     4238      +10     

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