Ensembler Image Building API

[ariefrahmansyah]

Description

The image-building process of the Turing ensembler jobs and services are tightly coupled with the serving flow. If the image-building failed, the serving would fail too.

This PR introduces a new Image Building API to trigger the image building process programmatically and separately from the serving flow.

Modifications

1. Add new Image Building API which calls the new Image Building Service layer
   a. Add ListImages endpoint that will return the job and services images for a given ensembler.
   b. Add BuildImage endpoint that will build an job or service image
2. Add Image Building Service layer which calls the imagebuilder/imagebuilder.go

Tests

Checklist

• Added PR label
• Added unit test, integration, and/or e2e tests
• Tested locally
• Updated documentation
• Update Swagger spec if the PR introduce API changes
• Regenerated Golang and Python client if the PR introduces API changes

Release Notes

NONE

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[deadlycoconuts]

LGTM! Thanks for this super long PR. I've left some comments which might no longer be relevant anymore after your latest pushes 😅