## Summary
Closes https://github.com/elastic/kibana/issues/151985
- ~~This PR introduces `maxUploadSize` file kind setting, which allows
to enforce upload size per file, instead of using one value for the
whole file kind~~.
- ~~I left the `maxSizeBytes` as-is for now, because it is actually used
in two places: (1) in the Files client; (2) in HTTP routes. So, I didn't
find an easy way to reuse it~~.
- Allows to configure max upload size per file.
- This required separation of `FileKind` interface between browser and
server. And correspondingly changes to the file kind registry.
### Checklist
Delete any items that are not applicable to this PR.
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
### For maintainers
- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)
---------
Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
