support integration with VS code in gradle plugin

[fstaudt]

Task aggregateJsonSchema should configure JSON schema mappings for vscode (yaml.schema in .vscode/settings.json) when .vscode folder is detected in project.

[fstaudt]

helm-values-shared should be packaged as a webserver in a GraalVM native image (Unix, MacOS and Windows).

helm-values VS code extension can then run webserver in background and call its API to reuse business logic from shared Java library.