[SDK] Fix types error

[helenxie-bit]

What this PR does / why we need it:
This PR adds __init__.py in types holder.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #2422

Checklist:

• Docs included if any changes are user facing

[andreyvelich]

@helenxie-bit Thanks for fixing this, please can you verify locally that it resolves the issue ?
E.g. install SDK from your local branch, and test it:

pip install git+https://github.com/helenxie-bit/katib.git@<BRANCH>#subdirectory=sdk/python/v1beta1

[helenxie-bit]

@helenxie-bit Thanks for fixing this, please can you verify locally that it resolves the issue ? E.g. install SDK from your local branch, and test it:

pip install git+https://github.com/helenxie-bit/katib.git@<BRANCH>#subdirectory=sdk/python/v1beta1

@andreyvelich @Electronic-Waste I have tested the example code in the issue locally with this version of SDK and it finished successfully. It should fix the problem.

[Electronic-Waste]

Thanks @helenxie-bit, it works!

[helenxie-bit]

Thanks @helenxie-bit, it works!

@Electronic-Waste Glad to hear that!

@andreyvelich Please review when you have time. Thanks!

[andreyvelich]

Thanks for the fix @helenxie-bit!
/lgtm
/approve

[google-oss-prow]

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