feat: read in dependency charts

[qvalentin]

This allows using the following of the dependency charts:

template files

• you can use hover/go-to-definition on includes of dependencies e.g. name: {{ include "common.names.name" . }}

values files

• you can use hover/completion/go-to-definition with the values of the dependencies e,g, example: {{ .Values.common.exampleValue }}

Todos:

• [ ] Add note in readme that you should run helm dependency build
• [x] Add dependency charts to the chartstore
• [ ] make sure values files are synced to disk
• [ ] tests