Create reusable kfp components MinIO

[ca-scribner]

To help users access files from MinIO when using kubeflow pipelines, create reusable components (eg: component yaml files that can be accessed via load_component_from_url()). These components should use the automatically mounted secrets for MinIO and avoid errors due to the race condition where the main pod may be running before vault has mounted the secrets.

[ca-scribner]

Components get_from_minio and put_to_minio are complete. They:

• infer MinIO credentials automatically from the environment (using Vault's mounted secrets), allowing users to choose the tenant
• let users optionally override the credentials with manually entered ones
• avoid the vault credential race condition by iteratively checking for the files before using them

A simple example of use is also included, and serves as a rudimentary test case.

The files are temporarily located off StatCan repos because I haven't found a natural home for them yet.

Future work:

• add to docs
• add rigorous test cases
• add to StatCan repos (standalone repo of reusable components? incorporate in mlops repo?)

[ca-scribner]

cc @blairdrummond @brendangadd