* create changelog for datafusion and ballista release

Created changelog for the following projects:

* datafusion 5.0.0
* python 0.3.0
* ballista 0.5.0

Other changes:

* updated CHANGELOG.md in the repo root to point to changelogs in
subproject folders
* updated dev/release/update_change_log.sh to take subproject as argument
* added dev/update_ballista_versions.py to help update ballista crate versions.

* ignore autogenerated CHANGELOG.md from prettier run

* expand file glob within prettier

'**' pattern is not supported to some of the shells including the one we
use in CI.

* exclude subproject changelog from rat

* update changelog to latest master

* update changelog with updated pr labels

* update datafusion version in readme

* add verify-release-candidate.sh

* update changelog for latest master

* update release email formatting

* update verify-release-candidate.sh permission

* cargo test all in release verify script