feat: Added option to pass custom WES Adapter environment variables

[kankou-aliaksei]

Issue #: #396

Description of Changes

[//]: # This adds option to pass custom environment variables into WES Adapter
[//]: # This adds option to pass custom environment variables into Workflow Job

Description of how you validated changes

[//]: # Add configuration for context

contexts:
  miniContext:
    customWesEnvVars:
      - key: k1
        value: v1
      - key: CUSTOM_WORKFLOW_JOB_ENV_VARS
        value: "[{ \"key\": \"MINIWDL__AWS__BOTO3_RETRIES\", \"value\": { \"max_attempts\": 15, \"mode\": \"standard\" } }, { \"key\": \"MINIWDL__AWS__DESCRIBE_PERIOD\", \"value\": 10 }, { \"key\": \"MINIWDL__AWS__SUBMIT_PERIOD\", \"value\": 10 }]"
    engines:
      - type: wdl
        engine: miniwdl

[//]: # Deploy context agc context deploy --context miniContext
[//]: # After context deploying a WES Adapter Lambda must have k1 and CUSTOM_WORKFLOW_JOB_ENV_VARS env vars
[//]: # After agc workflow run hello --context miniContext go to Batch Workflow Job Logs and find MINIWDL__AWS__BOTO3_RETRIES, MINIWDL__AWS__DESCRIBE_PERIOD, MINIWDL__AWS__SUBMIT_PERIOD vars under === ENVIRONMENT === section

Checklist

• If this change would make any existing documentation invalid, I have included those updates within this PR
• I have added unit tests that prove my fix is effective or that my feature works
• I have linted my code before raising the PR
• Title of this Pull Request follows Conventional Commits standard: https://www.conventionalcommits.org/en/v1.0.0/

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[nh13]

Looking forward to this so I can set config options as per chanzuckerberg/miniwdl#570