Servicex

Fixed a fatal bug that causes error:

AttributeError: 'ConfigSettings' object has no attribute 'get_files'

* Update to qastle 2.10 and allow qastle dependency to float
* Add safety check to ci job

Two minor updates:

- Truncate filenames that are too long for some filesystems.
- Update link to the package home page.

This version of `servicex` is deisgned to work with the RC3 backend of [`ServiceX`](https://github.com/ssl-hep/ServiceX).

- Uses the new RC3 API tokens
- Uses the `minio` secured endpoints supported by RC3
- Supports both `xAOD` and `uproot` backends, and includes ways of including other types of backends in the future.
- Use `ignore_cache` to ignore the local cache
- Uses default image configured with `ServiceX` - and records that image locally in the cache for reproducibility possibilities.

This is really a RC - we think this is the final set

- Uses API tokens to work with ServiceX
- Defaults to no image name - which means that you end up using the default in ServiceX
- Add `ignore_cache` to allow one to ignore the current cache when submitting a query.

- Do not close the root file when we load a lazy array from it. The LazyArray requires things to be open.