WIP feat(backend + sdk): Implement Pipeline Configuration with TTL

[rimolive]

Description of your changes:
This PR introduces a new class PipelineConfig in KFP SDK to add pipeline-specific configurations with the first one: Pipeline TTL.

Supersedes #11112

Testing instructions

SDK

• Create a Python virtualenv and install the SDK and IR YAML API packages locally

$ python -m venv .venv
$ source .venv/bin/activate
$ pip install wheel setuptools protobuf==4.21.1 grpcio grpcio-tools
$ pip install -r sdk/python/requirements-dev.txt
$ pip install -e api/v2alpha1/python
$ pip install -e sdk/python

• Use the example code to compile

$ kfp dsl compile --py main.py --output main.yaml

• You should be able to compile and find the following snippet in the main.yaml file:

---
platforms:
  kubernetes:
    pipelineConfig:
      pipelineTtl: 60

Backend

• Build the API Server image and push to an image registry
• Upload main.yaml file generated in the SDK section
• Check in KFP UI Pipeline Spec tab if the following snippet is present:

platform_spec:
  platforms:
    kubernetes:
      pipelineConfig:
        pipelineTtl: 60

• Create a run and check if TTL configuration is present in Workflow CR:

$ oc get workflow -o yaml $(oc get workflow --no-headers | awk '{print $1}') | yq .spec.ttlStrategy
secondsAfterCompletion: 60

Checklist:

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[google-oss-prow]

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