WIP: refactor/adapters

[wwmoraes]

Changes

Added a separate tool to be used with go generate and ease adapter maintenance, namely:

• adapter gen - zero code adapter implementation for a kubernetes resource type. The end result enables kubegraph to create nodes for the target kind with an icon, if provided. Resources with dependencies must still override the Create and/or Configure methods and implement the proper logic.
• adapter dep - injects type aliases and a getter function to retrieve adapter instances for external kinds. This prevents circular references between adapter packages.
• adapter scheme - imports and composes schemes with the main decoder scheme to add support for virtually any resource.

---

With the tool above, the adapters received the following changes:

• most boilerplate code that was copy-pasted is now gone; it is now handled by the generator
• basic resource types now have only the generated adapter files, as no Create/Configure is needed
• schemes are now implemented through generated files to import and compose the scheme during runtime
• registry now provides aliases for indirect types, so adapters don't need to import transient dependencies, such as dot and k8s API runtime.

Non-breaking

• feat - adds functionality for the user
• fix - fixes an issue for the user
• docs - changes to the documentation
• style - formatting, missing semi colons, etc
• refactor - refactoring production code, eg. renaming a variable
• test - adding missing tests, refactoring tests
• chore - configuration of lint, IDE, issue template, etc

Breaking

• feat! - adds functionality for the user, but changes existing functionality
• fix! - fixes an issue for the user, but changes existing functionality
• refactor! - changes that replaces existing functionality, eg. changing arity of a function
• chore! - updating build scripts, etc