Blog post for 5.0.0 release

[nealrichardson]

No description provided.

[github-actions]

Thanks for opening a pull request!

Could you open an issue for this pull request on JIRA?
https://issues.apache.org/jira/browse/ARROW

Then could you also rename pull request title in the following format?

ARROW-${JIRA_ID}: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - How to contribute patches

[alamb]

I have draft content for the 5.0.0 rust blog here: https://docs.google.com/document/d/1QVvngReUcAtBf7Tz_TAHZZeXT9W1mha3UwgF_uGys9E/edit?ts=60ee7f5d#

I would personally prefer a separate blog post as the overall arrow release is pretty large and the rust details may get lost several pages down but I am curious what others think

[alamb]

Here is proposed 5.0 content for Rust: #128

[ianmcook]

If anyone has additional changes or additions, please suggest them as soon as possible so we can get this posted.