[blog] 0.9 Release announcement

[polyzos]

No description provided.

[MehulBatra]

We need to consider $binlog aswell, more information can be taken from:
https://fluss.apache.org/docs/0.9/table-design/virtual-tables/#binlog-table

[luoyuxia]

@polyzos Thanks for the pr. Just left minor comments. PTAL

[wuchong]

Hi @polyzos, I have pushed a commit to update the blog from my perspective. Below are the key changes; please feel free to modify them if you have any concerns:

1. Added a feature overview image at the beginning of the post.
2. Included Upgrade Notes and List of Contributors sections, consistent with previous release blogs.
3. Renamed the Virtual Table section to Change Data Feed to better introduce the $binlog and $changelog virtual tables.
4. Refined the More Improvements section by adding minor features and removing unnecessary items.
5. Mentioned Delta Join in the Flink Integration section.
6. Updated FIP links to point directly to the documentation.
7. Expanded on usage scenarios for the Aggregation Merge Engine and auto-increment columns.
8. Addressed @luoyuxia's comments and fixed several documentation errors.

[MehulBatra]

Base banner in case we wanna add texts/features accordingly

Release Banner:

[wuchong]

LGTM.

Additionally, should we define a release title for this blog post, similar to the 0.8 version: "Announcing Apache Fluss (Incubating) 0.8: Streaming Lakehouse for Data + AI"?

[polyzos]

@wuchong I think we can publish as is.. it will be hard, trying to find a title for every release