deprecate reference package, migrate to github.com/distribution/reference

This integrates the new module, which was extracted from this repository
at commit b9b19409cf458dcb9e1253ff44ba75bd0620faa6;

    # install filter-repo (https://github.com/newren/git-filter-repo/blob/main/INSTALL.md)
    brew install git-filter-repo

    # create a temporary clone of docker
    cd ~/Projects
    git clone https://github.com/distribution/distribution.git reference
    cd reference

    # commit taken from
    git rev-parse --verify HEAD
    b9b19409cf

    # remove all code, except for general files, 'reference/', and rename to /
    git filter-repo \
      --path .github/workflows/codeql-analysis.yml \
      --path .github/workflows/fossa.yml \
      --path .golangci.yml \
      --path distribution-logo.svg \
      --path CODE-OF-CONDUCT.md \
      --path CONTRIBUTING.md \
      --path GOVERNANCE.md \
      --path README.md \
      --path LICENSE \
      --path MAINTAINERS \
      --path-glob 'reference/*.*' \
      --path-rename reference/:

    # initialize go.mod
    go mod init github.com/distribution/reference
    go mod tidy -go=1.20

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

registry/api/v2/descriptors.go

@@ -4,8 +4,8 @@ import (
 	"net/http"
 	"regexp"
 
-	"github.com/distribution/distribution/v3/reference"
 	"github.com/distribution/distribution/v3/registry/api/errcode"
+	"github.com/distribution/reference"
 	"github.com/opencontainers/go-digest"
 )
 

registry/api/v2/urls.go

@@ -6,7 +6,7 @@ import (
 	"net/url"
 	"strings"
 
-	"github.com/distribution/distribution/v3/reference"
+	"github.com/distribution/reference"
 	"github.com/gorilla/mux"
 )
 

registry/api/v2/urls_test.go

@@ -7,7 +7,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/distribution/distribution/v3/reference"
+	"github.com/distribution/reference"
 )
 
 type urlBuilderTestCase struct {