Load Conda.jl lazily

[JamesWrigley]

Tested manually.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.94%. Comparing base (b6d1203) to head (01416aa).

Files with missing lines	Patch %	Lines
src/jupyter.jl	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1187      +/-   ##
==========================================
- Coverage   68.65%   67.94%   -0.71%     
==========================================
  Files          16       16              
  Lines        1056     1067      +11     
==========================================
  Hits          725      725              
- Misses        331      342      +11     

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