[feat req] Alphabetical ordering for splits in dataset viewer
### Link

https://huggingface.co/datasets/mozilla-foundation/common_voice_11_0

### Description

Currently, the datasets splits for the viewer are displayed in a seemingly random order, see example for [Common Voice 11](https://huggingface.co/datasets/mozilla-foundation/common_voice_11_0):
<img width="1505" alt="Screenshot 2022-10-21 at 14 04 39" src="https://user-images.githubusercontent.com/93869735/197192381-46ca4041-db69-423e-be55-abf96e70167a.png">

It would be easier to traverse the list of possible splits if they were arranged alphabetically!

[feat req] Alphabetical ordering for splits in dataset viewer: ### Link

https://huggingface.co/datasets/mozilla-foundation/common_voice_11_0

### Description

Currently, the datasets splits for the viewer are displayed in a seemingly random order, see example for [Common Voice 11](https://huggingface.co/datasets/mozilla-foundation/common_voice_11_0):
<img width="1505" alt="Screenshot 2022-10-21 at 14 04 39" src="https://user-images.githubusercontent.com/93869735/197192381-46ca4041-db69-423e-be55-abf96e70167a.png">

It would be easier to traverse the list of possible splits if they were arranged alphabetically!
