added crds to tidb-operator charts for install it automic

[zerix]

What problem does this PR solve?

Closes #4901(issue number)

What is changed and how does it work?

1. tidb-operator charts added a crds path.
2. added manifest/crd.yml file to tidb-operator/crds/.

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

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[csuzhangxc]

CRD in Helm chart may not work well when updating the Helm chart, ref helm/helm#8668

So I prefer to do not to include the CRD in the Helm chart.