feat: BFF is able to run (mocked) without Kubernetes

[ederign]

In this PR:

• Kubernetes client mock
• Update on BFF readme

Description

To make it easy for front-end and BFF developers to run FE and BFF without Kubernetes, I've created a simple mocked client that returns a model registry and points the service to localhost:8080 (where docker-compose is running).

How Has This Been Tested?

Please go through README.md to double-check if everything works as expected.

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[ederign]

@alexcreasy, please double-check if you can onboard with the BFF just reading the instructions?

[alexcreasy]

@ederign I've run this with MOCK_K8S_REQUESTS=true enabled and it works nicely, I'm able to make the requests against the API as listed in the README without any errors.

Just to note, I ran this using podman desktop with docker compose compatibility enabled, without any issues.

[ederign]

@tarilabs, we are ready to review!

[tarilabs]

thanks #190 (comment)
/lgtm
/approve

[google-oss-prow]

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