Adding PAG for SD + controlnet + img2img : StableDiffusionControlNetPAGImg2ImgPipeline

[charchit7]

What does this PR do?

Fixes #9886

Todo :

• draft PR
• test the pipeline locally

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline?
• Did you read our philosophy doc (important for complex PRs)?
• Was this discussed/approved via a GitHub issue or the forum? Please add a link to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

[charchit7]

Hi Team,

If anyone is monitoring this PR, I am stuck with a family medical emergency from the past couple of weeks.

Will assume once things are sorted.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the contributing guidelines are likely to be ignored.