Fix connection hangs + timeout bug

[csvance]

This addresses #81

• Connection timeouts were not being used allowing connections to potentially hang forever
• deadline was potentially not being provided properly to curl. Take the ceil of the provided number and convert to Clong
• Allow precompile to fail gracefully if the test server cannot be reached and suggest some potential workarounds to the user

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 70.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.39%. Comparing base (ad3fd46) to head (921cb79).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/gRPCClient.jl	66.66%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   83.91%   83.39%   -0.53%     
==========================================
  Files           7        7              
  Lines         541      554      +13     
==========================================
+ Hits          454      462       +8     
- Misses         87       92       +5     

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