Add blog post on new transformation framework #5856

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:

• feat: Kickoff Transformation implementationtransformation code base #5181
• feat: Compute Engine Initial Implementation #5223
• feat: Local compute engine #5278
• feat: Spark Transformation #5185
• feat: Offline store update pull_all_from_table_or_query to make timestampfield optional #5281
• feat: Enable write node for compute engine #5287
• feat: Refactor materialization engine #5354
• feat: Update Spark Compute read source node to be able to use other data sources #5445
• feat: Update doc #5521
• feat: Continue updating doc #5523
• feat: Support aggregation in odfv #5666
• feat: Feast dataframe phase1 #5611
• feat: Feast dataframe phase2 #5612
• fix: FeatureView serialization with cycle detection #5502
• feat: Support table format: Iceberg, Delta, and Hudi #5650
• feat: Add aggregation in OnDemandFeatureView #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.