Linting for import groups

[m1kola]

We already have some linting for imports here, but would be nice to have linting for import groups.

I'm thinking the the following grouping:

• Standard library
• 3rd-party packages excluding github.com/operator-framework/*
• 3rd-party package from github.com/operator-framework/*
• Local imports from github.com/operator-framework/operator-controller/*

I find this grouping helpful becuase it is very quick to distinguish OF dependencies from other 3rd party dependenices.

I think https://golangci-lint.run/usage/linters/#gci might be able to help with that.

[m1kola]

It will look something like this:

import (
	"context"
	"fmt"
	"sort"

	"k8s.io/apimachinery/pkg/util/sets"

	"github.com/operator-framework/deppy/pkg/deppy"
	"github.com/operator-framework/deppy/pkg/deppy/input"

	"github.com/operator-framework/operator-controller/internal/catalogmetadata"
	catalogfilter "github.com/operator-framework/operator-controller/internal/catalogmetadata/filter"
	catalogsort "github.com/operator-framework/operator-controller/internal/catalogmetadata/sort"
	olmvariables "github.com/operator-framework/operator-controller/internal/resolution/variables"
)

vs this (it becomes messier with more imports):

import (
	"context"
	"fmt"
	"sort"

	"github.com/operator-framework/deppy/pkg/deppy"
	"github.com/operator-framework/deppy/pkg/deppy/input"
	"k8s.io/apimachinery/pkg/util/sets"

	"github.com/operator-framework/operator-controller/internal/catalogmetadata"
	catalogfilter "github.com/operator-framework/operator-controller/internal/catalogmetadata/filter"
	catalogsort "github.com/operator-framework/operator-controller/internal/catalogmetadata/sort"
	olmvariables "github.com/operator-framework/operator-controller/internal/resolution/variables"
)