<!-- Thank you for your contribution! Please review
https://github.com/ray-project/ray/blob/master/CONTRIBUTING.rst before
opening a pull request. -->

<!-- Please add a reviewer to the assignee section when you create a PR.
If you don't have the access to it, we will shortly find a reviewer and
assign them to your PR. -->

## Why are these changes needed?

<!-- Please give a short summary of the change and the problem this
solves. -->
In write_parquet, we want to be able to support
- `OVERWRITE`: (If dir present, delete then write, otherwise, just
create dir, then write)

A more detailed description can be found in
https://spark.apache.org/docs/latest/sql-data-sources-load-save-functions.html#save-modes

This PR was meant to address
https://anyscale1.atlassian.net/browse/DATA-946, but since the other
save modes weren't that much work, I added the additional following 3
from apache spark too
- `IGNORE`: (if dir present, silently pass)
- `ERROR`: (if dir present, throw error)
- `APPEND` (this is the current behavior we have, if dir present, we
append files. Any conflicting file names are overwritten)

## Related issue number
attentive requesting this
<!-- For example: "Closes ray-project#1234" -->

## Checks

- [ ] I've signed off every commit(by using the -s flag, i.e., `git
commit -s`) in this PR.
- [ ] I've run `scripts/format.sh` to lint the changes in this PR.
- [ ] I've included any doc changes needed for
https://docs.ray.io/en/master/.
- [ ] I've added any new APIs to the API Reference. For example, if I
added a
method in Tune, I've added it in `doc/source/tune/api/` under the
           corresponding `.rst` file.
- [ ] I've made sure the tests are passing. Note that there might be a
few flaky tests, see the recent failures at https://flakey-tests.ray.io/
- Testing Strategy
   - [ ] Unit tests
   - [ ] Release tests
   - [ ] This PR is not tested :(

---------

Co-authored-by: Balaji Veeramani <balaji@anyscale.com>
Signed-off-by: weiran11 <weiran11@baidu.com>