Instrument to promote best practices of writing werf configurations

[distorhead]

Before proceeding

• I didn't find a similar issue

Problem

We need some linting instrument to check that your werf project configuration: werf.yaml and .helm/templates confirms with some known best practices.

Solution (if you have one)

1. werf lint command which performs some checks based on some rules.
2. Mechanics for updating linting rules, to receive updates for such rules, ability to lock for some version of rules, updatable living database of such rules.
3. Ability to enable such linting by default in the converge-like commands.

Additional information

Older issues:

• New linter for kubernetes templates werf#2204
• Helm lint and lint-matrix werf#2710