load plug-ins in try..except block

[kshitij12345]

Before submitting checklist

• Did you update the CHANGELOG? (not for test updates, internal changes/refactors or CI/CD setup)
• Did you ask the docs owner to review all the user-facing changes?

Load CLI plug-ins in try..except block to avoid a failure in loading a plug-in to crash entire CLI. Tested locally.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -6.56% ⚠️

Comparison is base (d1f0c0e) 79.50% compared to head (3eeb232) 72.95%.

❗ Current head 3eeb232 differs from pull request most recent head be2c2e4. Consider uploading reports for the commit be2c2e4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1392      +/-   ##
==========================================
- Coverage   79.50%   72.95%   -6.56%     
==========================================
  Files         280      280              
  Lines       13866    13580     -286     
==========================================
- Hits        11024     9907    -1117     
- Misses       2842     3673     +831     

Flag	Coverage Δ
e2e	?
e2e-	?
e2e-management	?
e2e-s3	?
e2e-s3-gcs	?
e2e-standard	?
macos	72.79% <0.00%> (-6.44%)	⬇️
macos-latest	?
py3.10	?
py3.7	72.95% <0.00%> (-6.04%)	⬇️
py3.7.16	?
py3.8	?
py3.9	?
ubuntu	72.95% <0.00%> (-6.33%)	⬇️
ubuntu-latest	?
unit	72.95% <0.00%> (-0.79%)	⬇️
windows	?

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Files Changed	Coverage Δ
src/neptune/cli/__main__.py	0.00% <0.00%> (ø)

... and 109 files with indirect coverage changes

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