Support HDFS via hdfs-native-object-store package

[SchutteJan]

closes #266

I've been able to verify this implementation works using the kernel examples. I am not sure what can be added in terms of tests, let me know if anything there is needed.

I've ran my tests using the MiniDfs implementation from hdfs-native, see example here:
https://github.com/Kimahriman/hdfs-native/blob/ebb5a2f98ab9fe487091403f45324650e3cd65fb/rust/examples/simple.rs

With MiniDFS running:

$ cd kernel/examples/read-table-multi-threaded/
$ cargo run hdfs://localhost:9000/my_delta_table/
Reading hdfs://localhost:9000/my_delta_table/
+----+-------+
| id | value |
+----+-------+
| 1  | foo   |
| 2  | boo   |
+----+-------+

[nicklan]

amazing thanks!

couple of small things but looks solid.

[nicklan]

lgtm! just one small request to put the cargo command for the test as a comment in the test file

[hntd187]

Looks good, I just had some minor fixes I'd like.