[Docs] Update the Rust implementation status page

[alamb]

Describe the enhancement requested

Inspired by @jecsand838 on

• [Docs][Rust] Mark Avro external data format status as R/W for Rust #47930

As well as redirecting the rust status page here

• docs: Add link to the Arrow implementation status page arrow-rs#8732

Let's update the page for the Rust implementation:

• https://arrow.apache.org/docs/status.html

Component(s)

Website, Documentation