Replace wget with aiohttp

[bkmgit]

Based on:

• https://likegeeks.com/downloading-files-using-python/
• https://docs.aiohttp.org/en/latest/http_request_lifecycle.html
• https://codereview.stackexchange.com/questions/259112/async-download-of-files
• https://docs.aiohttp.org/en/stable/client_quickstart.html

[bkmgit]

Would close https://github.com/Thinklab-SJTU/pygmtools/issues/60

[codecov[bot]]

Codecov Report

Merging #73 (0e7ac02) into main (b6e4dd1) will increase coverage by 0.03%. Report is 2 commits behind head on main. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   92.89%   92.92%   +0.03%     
==========================================
  Files          20       20              
  Lines        7586     7595       +9     
==========================================
+ Hits         7047     7058      +11     
+ Misses        539      537       -2     

Files Changed	Coverage Δ
pygmtools/neural_solvers.py	88.62% <ø> (ø)
pygmtools/utils.py	85.50% <100.00%> (+0.28%)	:arrow_up:

... and 1 file with indirect coverage changes

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[rogerwwww]

Nice work!