Split into subprojects for compiler and language server

[bentsherman]

The build seems to work:

./gradlew build

And produces the following files:

$ find build/
build/
build/libs
build/libs/language-server.jar
build/tmp
build/tmp/jar
build/tmp/jar/MANIFEST.MF

But the manifest seems to be wrong:

$ java -jar build/libs/language-server.jar 
no main manifest attribute, in build/libs/language-server.jar

I think something is wrong with the shadow JAR build, even though I didn't change any settings for it in the gradle build

[bentsherman]

I added a convention plugin and a task to copy the shadow JAR to the top-level

Now I am testing the gradle build for the vs code extension and getting this error:

Could not determine the dependencies of task ':language-server:copyJar'.
> Task with path ':modules:language-server:build' not found in project ':language-server'.

The vs code extension has this settings.gradle:

rootProject.name = 'vscode-language-nextflow'
include 'language-server'

And this gradle task to copy the shadow JAR into the extension build:

task copyJar(type: Copy) {
  dependsOn ':language-server:build'
  from "$projectDir/language-server/build/libs/language-server-all.jar"
  into "$buildDir/bin"
}

For some reason, gradle can't find the build task for the language server subprojects when building from the vs code extension

[bentsherman]

I need to keep moving with other things so I'm going to merge what I have for now. I can make it work by manually building the language server JAR and only copying it from the vs code build:

// settings.gradle (vs code extension)
rootProject.name = 'vscode-language-nextflow'
// include 'language-server'

// build.gradle (vs code extenstion)
task copyJar(type: Copy) {
  // dependsOn ':language-server:build'
  from "$projectDir/language-server/build/libs/language-server-all.jar"
  into "$buildDir/bin"
}

# from the vs code repo
cd language-server
./gradlew build
cd ..
./gradlew build

I suspect there is just something wrong in the language server gradle build. If either of you have any more pointers or can spot the issue, please let me know