add format command on Makefile

[osodracnai]

This commit adds the format command to make it easier to be compliant to golangci-lint issues

Proposed Changes

This commit adds the format command to make it easier to be compliant to golangci-lint issues.

I would prefer to use the flag -local for goimports that will segregate imports by:

import(
native-go-dependence

external-dependece

our-project-dependence
)

will look something like this:

import (
	"context"
	"errors"
	"os"

	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"

	"github.com/k3s-io/k3s/pkg/cli/agent"
	"github.com/k3s-io/k3s/pkg/cli/cert"
)

but by applying this almost all files will be affected, so maybe apply this change and then another to improve.

Types of Changes

New feature

Verification

make format

Testing

Linked Issues

User-Facing Change

NONE

Further Comments

[dereknola]

nit: we don't have a vendor folder for k3s

[osodracnai]

if someone use make deps it generates one

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +28.16 🎉

Comparison is base (eb83af0) 19.45% compared to head (abde5fe) 47.61%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #7437       +/-   ##
===========================================
+ Coverage   19.45%   47.61%   +28.16%     
===========================================
  Files          81      140       +59     
  Lines        5495    14323     +8828     
===========================================
+ Hits         1069     6820     +5751     
- Misses       4204     6421     +2217     
- Partials      222     1082      +860     

Flag	Coverage Δ
inttests	44.97% <ø> (?)
unittests	19.85% <ø> (+0.40%)	⬆️

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see 140 files with indirect coverage changes

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