UI for writing x-bte annotations?

[colleenXu]

I'm not sure if a "UI for writing x-bte annotations" discussions / dev work needs to wait for x-bte refactoring work to be further along....or if it depends on other work for other issues like #522 and #707

This came up in old discussions between Jackson and me (and during our in-person week in April/May)...

A UI for writing x-bte annotations would be helpful. Some features could be:

• have the basic structure of the x-bte operation to fill out
• as the writer makes the list of x-bte references for the endpoint (ex), autopopulate info in the components section (like operation names, basic structure to fill out)
• maybe vice-versa? If the writer starts writing the full x-bte info in the components section first, automatically start making the list of x-bte references to put under the endpoint? (I'm not sure how this'll work on rethink, since we don't necessarily know which endpoint to put the references under)