Checking if the corresponding API lies on the classpath before adding the diagnostic collector

[bensonnw]

Description:

Currently we are adding all collectors in JDTServicesManager constructor, we probably should do it dynamically base on the classpath. For example, checking if they are using the jakarta.servlet specification in their project before adding the ServletDiagnosticsCollector

Specification:

Type of language feature proposed:

Select all that apply

• [x] diagnostic
• [ ] quick-fix
• [ ] snippet
• [ ] other, please specify: