refactor: using buildx and add format

[aarnphm]

Signed-off-by: Aaron Pham 29749331+aarnphm@users.noreply.github.com

• refactor to using buildx from bentoml
• add Makefile to format code with isort and black
• operator should now only return the dockerfile and the context_path
• TempDirectory context manager returns a Path instead of string

closes: #165

also fix analytics issues that failed ci tests

[codecov[bot]]

Codecov Report

Merging #166 (0034b40) into main (54ca196) will decrease coverage by 0.41%. The diff coverage is 57.14%.

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   60.39%   59.98%   -0.42%     
==========================================
  Files          24       24              
  Lines        1121     1112       -9     
==========================================
- Hits          677      667      -10     
- Misses        444      445       +1     

Flag	Coverage Δ
unit-tests	59.98% <57.14%> (-0.42%)	:arrow_down:

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Impacted Files	Coverage Δ
bentoctl/operator/operator.py	74.28% <ø> (ø)
bentoctl/utils/__init__.py	71.42% <ø> (ø)
bentoctl/utils/operator_helpers/utils.py	0.00% <0.00%> (ø)
bentoctl/cli/utils.py	73.52% <50.00%> (ø)
bentoctl/deployment_config.py	68.50% <50.00%> (+1.83%)	:arrow_up:
bentoctl/docker_utils.py	25.35% <50.00%> (+5.35%)	:arrow_up:
bentoctl/utils/temp_dir.py	42.30% <60.00%> (-33.70%)	:arrow_down:
bentoctl/cli/__init__.py	81.81% <100.00%> (-2.97%)	:arrow_down:
bentoctl/operator/registry.py	60.17% <100.00%> (ø)
bentoctl/utils/usage_stats.py	95.00% <100.00%> (ø)
... and 2 more

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