[Housekeeping] Add a license to the Python flyteidl library

[michaeltinsley]

Describe the issue

Currently the flyteidl Python library does not have a license embedded.
I assume that this should be Apache as per the rest of the repository.

What if we do not do this?

Lack of polish

Related component(s)

flyteidl Python lib

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[dosubot]

🤖

It's great to see your interest in adding a license to the Python flyteidl library. Your contribution will definitely add value to the repository. If you have a proposed solution or are willing to create a PR for this, that would be fantastic! Thank you for considering this improvement.

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