try to suppress messages and add timing information

[danielnachun]

This will clean up some of the messages from the TWAS weight fitting methods, and adds information that tells you how long each step takes.

[codecov]

Codecov Report

❌ Patch coverage is 84.70588% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.95%. Comparing base (b67e739) to head (ba7966e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
R/twas_weights.R	84.70%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #495      +/-   ##
==========================================
- Coverage   82.98%   82.95%   -0.04%     
==========================================
  Files          36       36              
  Lines        8146     8202      +56     
==========================================
+ Hits         6760     6804      +44     
- Misses       1386     1398      +12     

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