Create json schema for x-bte extensions

[newgene]

Similar to other OpenAPI extension schemas we support here:

https://github.com/SmartAPI/smartAPI/blob/77cdc450009beb52ee728071953203780b33a541/src/schemas.ini

Let's create json schema file for our x-bte extension too.

[newgene]

@NikkiBytes, @colleenXu had extensive experience of creating our x-bte extension metadata in SmartAPI registry, you both can work together on this issue.

[colleenXu]

Noting a previous/related issue is in BTE's repo https://github.com/biothings/biothings_explorer/issues/522.

[newgene]

@colleenXu thanks for reminding me the related issue. Let's consider this smartapi issue a sub-task of the the overall x-bte documention https://github.com/biothings/biothings_explorer/issues/522 issue.

I would like to push forward this issue and included @NikkiBytes to work with you.

[NikkiBytes]

New schema and example here Closing as complete.