Add release scripts (#290)

Add release scripts (#290)

* Add release scripts

fix #287

* dev/release/release_rc.sh: This prepares RC related artifacts and upload
  them to https://dist.apache.org/repos/dist/dev/arrow .
* dev/release/release.sh: This publishes voted RC to
  https://dist.apache.org/repos/dist/release/arrow .
* dev/release/README.md: This describes how to use the above scripts.
* .github/*: Add missing license headers.

They are confirmed as much as possible on local but some processes
can't be confirmed on local. There may be still some problems but they
will be fixed in the next release process.

* Describe how to use JuliaTagBot

Co-authored-by: Jacob Quinn <quinn.jacobd@gmail.com>
* Fix a typo

* Fix form

* Fix wrong author

Co-authored-by: Eric Hanson <5846501+ericphanson@users.noreply.github.com>
Co-authored-by: Jacob Quinn <quinn.jacobd@gmail.com>
Co-authored-by: Eric Hanson <5846501+ericphanson@users.noreply.github.com>