feat(sdk): support display_name and description in @dsl.pipeline decorator

[connor-mccarthy]

Description of your changes:

The @dsl.pipeline decorator now accepts display_name and description arguments. These are compiled to IR YAML.

from kfp import dsl

@dsl.pipeline(
    display_name='Human readable name',
    description='My description. Decorator argument takes precedence over docstring',
)
def my_pipeline():
    """Will use docstring description when decorator description is not provided.
         In this case, description is provided to decorator is docstring is unused.
    """
    ...

Checklist:

• The title for your pull request (PR) should follow our title convention. Learn more
  about the pull request title convention used in this repository.

[google-oss-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[connor-mccarthy]

/assign @chensun

[google-oss-prow]

@connor-mccarthy: The following test 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-sdk-execution-tests	01863b7	link	true	/test kubeflow-pipelines-sdk-execution-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[chensun]

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chensun

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• sdk/OWNERS [chensun]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment