Update Arrow release process to include Rust and DataFusion commits, contributors, changes in release notes

[alamb]

Bringing content from https://issues.apache.org/jira/browse/ARROW-12701, so we have visibility in arrow-rs

@ianmcook suggests:

For the 5.0.0 release, we should change the code in {{dev/releasepost-03-website.sh}} to include commits, contributors, and changes to the official {{apache/arrow-rs}} and {{apache/arrow-datafusion}} repos. This is import to ensure that the contributions to Rust, DataFusion, and Ballista are recognized in our release notes and blog posts going forward.

Which seems like a very good idea. @andygrove / @jorgecarleitao / @Dandandan do we have any thoughts / plans regarding release notes at this time?

[jorgecarleitao]

I will have a take on this one. 👍

[ianmcook]

The changelog generator added in #289 looks good, thanks!

We would like to link to this apache/arrow-rs changelog from the apache/arrow release notes. We would also like to include the apache/arrow-rs and apache/arrow-datafusion contributors and contribution counts so that these Rust contributions continue to be properly recognized there. @thisisnic is working to do this in apache/arrow#10774. @alamb or @jorgecarleitao could you please reply to Nic's question about that in ARROW-12701? Thanks!

[alamb]

Hi @ianmcook -- thank you for following up. I responded at https://issues.apache.org/jira/browse/ARROW-12701?focusedCommentId=17385759&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17385759