Import object_store, with history, from arrow-rs

[alamb]

• Part of [EPIC] Port object_store content from arrow-rs repository #2

Moves the contents of object_store from https://github.com/apache/arrow-rs to this new repository

I followed these instructions (everything I know I learned from stack overflow)
https://stackoverflow.com/questions/41811986/git-move-directory-to-another-repository-while-keeping-the-history

in arrow-rs:

git subtree split -P object_store/ -b alamb/object_store_move
git push alamb alamb/object_store_move  # push to my own fork

then in arrow-rs-object-store:

cd arrow-rs-object-store
git checkout --orphan temp
git pull https://github.com/alamb/arrow-rs alamb/object_store_move
git checkout main
git checkout -b alamb/import
git merge --allow-unrelated-histories temp    # Merge the unrelated commits back
git branch -d <temp> # cleanup

I also made a commit to copy over the .gitignore file

I checked the code out locally and it seems to work. I plan to port the CI as the next PR

andrewlamb@Andrews-MacBook-Pro-2:~/Software/arrow-rs-object-store$ cargo test
....