Add golangci-lint linter to enforce that the io/ioutil package is not used anymore

[rm3l]

What does this PR do?

This PR makes use of the golangci-lint [1] linters aggregator, configured with the depguard[2] linter to enforce that the deprecated io/ioutil [3] package is not used anymore in the code.

NOTE: Ideally, we should use all linters enabled by default by golangci-lint. But doing so reports a lot of issues, not relevant to the issue here (which is to enforce that 'io/ioutil' is not used anymore).
Enabling the default linters and fixing the issues reported can be done in a subsequent issue/PR.

[1] https://golangci-lint.run/
[2] https://golangci-lint.run/usage/linters/#depguard
[3] https://pkg.go.dev/io/ioutil#pkg-overview

Which issue(s) does this PR fix

Fixes devfile/api#1257

PR acceptance criteria

• Unit/Functional tests

• Documentation

How to test changes / Special notes to the reviewer

# Install golangci-lint
$ make lint_install

# Run linter. It should pass.
$ make lint        
golangci-lint run ./... --timeout 15m

$ echo $?
0

Below is an example of error reported should io/ioutil be used again:

☸ in ~/w/p/d/alizer on  1257-replace-alizer-io-ioutil-dependency--linter-checks (REVERTING) [$+⇡] via 🐹 v1.19.13 
$ make lint        
golangci-lint run ./... --timeout 15m
pkg/apis/enricher/framework/dotnet/dotnet_detector.go:18:2: import 'io/ioutil' is not allowed from list 'main': Deprecated since Go 1.16. Use the implementations from 'io' or 'os' packages instead. (depguard)
        "io/ioutil"
        ^
pkg/apis/recognizer/devfile_recognizer.go:19:2: import 'io/ioutil' is not allowed from list 'main': Deprecated since Go 1.16. Use the implementations from 'io' or 'os' packages instead. (depguard)
        "io/ioutil"
        ^
pkg/utils/detector.go:23:2: import 'io/ioutil' is not allowed from list 'main': Deprecated since Go 1.16. Use the implementations from 'io' or 'os' packages instead. (depguard)
        "io/ioutil"
        ^
test/check_registry/check_registry.go:6:2: import 'io/ioutil' is not allowed from list 'main': Deprecated since Go 1.16. Use the implementations from 'io' or 'os' packages instead. (depguard)
        "io/ioutil"
        ^
make: *** [Makefile:39: lint] Error 1

[thepetk]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rm3l, thepetk

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