feat: Add architecture diagram for stable diffusion blueprint

[ratnopamc]

What does this PR do?

Adds excalidraw architecture diagram for the stable diffusion blueprint on Inf2. We can use this folder to add other architecture diagrams for the blueprints that we build.
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Motivation

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Mandatory for new blueprints. Yes, I have added a example to support my blueprint PR
• Mandatory for new blueprints. Yes, I have updated the website/docs or website/blog section for this feature
• Yes, I ran pre-commit run -a with this PR. Link for installing pre-commit locally

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[ratnopamc]

Will raise a separate PR. Closing this.