Add blog post on new transformation framework

**Is your feature request related to a problem? Please describe.**
I want a blog post on the website that outlines the new transformation framework in feast. Please see these PRs:

- https://github.com/feast-dev/feast/pull/5181
- https://github.com/feast-dev/feast/pull/5223
- https://github.com/feast-dev/feast/pull/5278
- https://github.com/feast-dev/feast/pull/5185
- https://github.com/feast-dev/feast/pull/5281
- https://github.com/feast-dev/feast/pull/5287
- https://github.com/feast-dev/feast/pull/5354
- https://github.com/feast-dev/feast/pull/5445
- https://github.com/feast-dev/feast/pull/5521
- https://github.com/feast-dev/feast/pull/5523
- https://github.com/feast-dev/feast/pull/5666
- https://github.com/feast-dev/feast/pull/5611
- https://github.com/feast-dev/feast/pull/5612
- https://github.com/feast-dev/feast/pull/5502
- https://github.com/feast-dev/feast/pull/5650
- https://github.com/feast-dev/feast/pull/5629

**Describe the solution you'd like**
Please make sure the blog post is under `infra/website/docs/blog` and it would probably good to update `/docs` if needed.

Feel free to add a mermaid diagram or so. Please list @HaoXuAI and GitHub Copillot as the authors.