Remove dependency on psutil package

[angela97lin]

Closes #2993. Rather than deprecating the utils, I just removed the dependency on psutils which we used to show CPU metrics (# cores, memory).

Happy to discuss idea of removing the CLI entirely too!

[codecov]

Codecov Report

Merging #3093 (0887f11) into main (512ae29) will decrease coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main   #3093     +/-   ##
=======================================
- Coverage   99.8%   99.8%   -0.0%     
=======================================
  Files        313     313             
  Lines      30492   30490      -2     
=======================================
- Hits       30402   30400      -2     
  Misses        90      90             

Impacted Files	Coverage Δ
evalml/tests/utils_tests/test_cli_utils.py	100.0% <ø> (ø)
evalml/utils/cli_utils.py	100.0% <ø> (ø)

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[freddyaboulton]

Looks good to me @angela97lin !