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GH-41386: [Docs] Document Arrow Go Avro read support (#41393)

Updates the Implementation Status docs page to reflect that the Go
implementation can read Avro files.

For the Rust implementation, I inferred from [this
PR](https://github.com/apache/arrow-rs/issues/4886) and [this
comment](https://github.com/apache/arrow-rs/issues/5562#issuecomment-2024885348)
that we should hold off on indicating that the Rust implementation can
read Avro files.

* GitHub Issue: #41386