Add helm charts for training operator

[ChenYi015]

What this PR does / why we need it:

Add helm charts for training operator.

Which issue(s) this PR fixes :
Fixes #1197

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

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[ChenYi015]

/hold for review

[coveralls]

Pull Request Test Coverage Report for Build 10958395047

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 10937611143:	0.0%
Covered Lines:	66
Relevant Lines:	66

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💛 - Coveralls

[andreyvelich]

This is great, thank you for this @ChenYi015!
We have been discussing before that we might want to add helm charts only for Training V2. @kubeflow/wg-training-leads any thoughts ?

Additionally, how we can make sure that kustomize manifests and helm charts are maintained and in sync ?