feat(sdk.v1): add importer_spec metadata to v1

[ji-yaqi]

No description provided.

[google-oss-prow]

@ji-yaqi: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
kubeflow-pipelines-samples-v2	4ecd82b	link	true	/test kubeflow-pipelines-samples-v2
kubeflow-pipelines-tfx-python37	4ecd82b	link	true	/test kubeflow-pipelines-tfx-python37

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[chensun]

@ji-yaqi: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
kubeflow-pipelines-samples-v2 4ecd82b link true /test kubeflow-pipelines-samples-v2
kubeflow-pipelines-tfx-python37 4ecd82b link true /test kubeflow-pipelines-tfx-python37

For the tfx test failure, cherry-pick #7143 would fix it--so that we don't fail the test every time we back port changes.
For the v2 sample tests, you can ignore it. I'll remove the folder and update test config soon.

[chensun]

/lgtm
/approve

Thanks!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chensun

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