Add support for GCP secret manager

[jeevb]

Tested with:

from flytekit import Secret, task, workflow


@task(secret_requests=[Secret(group="mainsecret", key="na", group_version="1")])
def secret_task() -> str:
    with open("/etc/flyte/secrets/mainsecret/1") as f:
        return f.read()


@workflow
def wf() -> str:
    x = secret_task()
    return x

Note the use of the required key, even though the secrets plugin does not use it. @wild-endeavor: we may want to consider making this optional. Flytekit will also need support for including the group version in the file path when fetching secrets.

[codecov]

Codecov Report

Merging #547 (b1e6b2b) into master (01218d2) will increase coverage by 0.64%.
The diff coverage is 86.25%.

❗ Current head b1e6b2b differs from pull request most recent head 54372c6. Consider uploading reports for the commit 54372c6 to get more accurate results

[EngHabu]

🥳 awesome! thank you, @jeevb