Sort yaml keys alphabetically in values.yaml inside the Helm chart

## Feature Request

### What problem are you trying to solve?

Big YAMLs are hard to read. When one needs to add a new value, it's hard to decide in what position it should be added. Also it's hard to compare two files when a lot of keys have been changed in a customization.

### How should the problem be solved?

Setup the new convention and sort all keys alphabetically (root level only).

### Any alternatives you've considered?

Not really, it's a pretty known common solution for YAMLs.

### How would users interact with this feature?

Nothing new for users.

Open the Helm chart's values.yaml and inventory its root-level keys before changing their order. Alphabetize the root-level keys only, then verify that the chart remains valid and that the resulting file establishes the requested convention.

Written by the indexing model from the issue text.