Add Spring Data JPA assist in Visual Studio Code

[FaiyazMujawar]

It would be nice to have Spring Data Jpa Assist support in Visual Studio Code, as in Intellij.

Intellij has a nice feature that suggests which properties and operations can be specified in the function name in a repository interface for building a JPA query. It would be nice to have the same in vscode as well.

Currently, no such feature is available through any extension 🥲

[martinlippert]

Closing this one as a duplicate of #107. Please feel free to comment on that, especially with key features you would like to see first and foremost. Would be interesting to hear about your priorities in this space.