The ability to trigger a build server refresh is currently missing from the protocol.

This issue is a follow up of sbt/sbt#5783. Adding a build/reload request will ease the integration between IntelliJ and sbt, as well as IntelliJ and Bloop.

Basically,

• workspace/buildTargets is safe and returns the latest known state of the build
• build/reload asks the server to refresh the state of the build but it can fail, in which case the server might stop responding

A typical scenario would be:

• the user changes the build configuration file then clicks the reload button
• a build/reload request is sent by the client to the server
• the server reload the configuration
• after reloading successfully it replies with a success response
• the client sends a workspace/buildTargets request to ask the new list of build targets