registerQueryTransformer does not work with searchStreaming

Created by: muratsu

When searchStreaming is enabled, the registerQueryTransformer stops working.

Steps to reproduce:

1. Enable an extension which uses registerQueryTransformer like java-imports-search
2. Enable searchStreaming by adding this to your user config "experimentalFeatures": {"searchStreaming": true}
3. Search for java.imports:java.io.IOException

Expected behavior:

• Search query to convert from java.imports:[package name] to ^import\\s(?:static\\s)?' + [package name] + '[^\\s]*;$ lang:java patternType:regexp

Actual behavior:

• Search query doesn't change