feat(config): add `env` block to deployment config

[judahrand]

Description

See here for context: https://github.com/bentoml/google-cloud-run-deploy/pull/21#discussion_r984038740

UI:

Select y: Enter BENTOML_CONFIG_OPTIONS: Enter api_server.workers=1: Select n:

closes:

[judahrand]

@ssheng @jjmachan How does this look to you both as an interface for including env in the deployment_config.yaml?

[judahrand]

I'll fix the tests when I get the chance. Didn't want to put the effort in until I knew the UI approach was reasonable/acceptable.

[ssheng]

@judahrand, there are maybe a few places in the unit tests that needed to be updated. Could you please help fix them when you get a chance?

[codecov[bot]]

Codecov Report

Merging #196 (f7571d0) into main (68574bc) will increase coverage by 0.68%. The diff coverage is 97.22%.

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
+ Coverage   59.05%   59.73%   +0.68%     
==========================================
  Files          24       22       -2     
  Lines        1138     1150      +12     
==========================================
+ Hits          672      687      +15     
+ Misses        466      463       -3     

Flag	Coverage Δ
unit-tests	59.73% <97.22%> (+0.68%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
bentoctl/deployment_config.py	71.52% <94.73%> (+3.02%)	:arrow_up:
bentoctl/cli/interactive.py	92.15% <100.00%> (+0.78%)	:arrow_up:
bentoctl/__init__.py
bentoctl/utils/__init__.py

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