Quick fix action to refactor field injection to constructor injection

[MahatmaFatalError]

In general, field injection comes with some downsides http://olivergierke.de/2013/11/why-field-injection-is-evil/

Unfortunately, refactoring of old, grown code bases towards constructor injection is tedious. So I was looking for a refactoring automation (and apparently I was not the first one with this issue https://stackoverflow.com/questions/44008985/convert-spring-field-injection-to-constructor-injection-intellij-idea)

So in essence, a quick fix action on @Inject or @Autowired fields to create a new or extend an existing constructor (depending on (required = false) flag) would be really nice.

[BoykoAlex]

This will take about 3-5 weeks to implement.
First of we'd need an extension mechanism in JDT LS to contribute to quick fix processors (similarly the way eclipse JDT allowed doing this). We'd need to create a good PR with tests for JDT LS which would take time.
Secondly, contribute a quick fix processor and possibly reconciling if we'd want to mark autowired field with a warning or info to make this finally work.

[martinlippert]

I was hoping that this could be implemented inside of the Spring Boot language server, as the LSP offers something like quick fixes and things like that. Any thoughts around that approach?