Refactor source API (#1846)

* refactor source API and syft json source block

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* update source detection and format test utils

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* generate list of all source metadata types

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* extract base and root normalization into helper functions

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* preserve syftjson model package name import ref

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* alias should not be a pointer

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

syft/internal/fileresolver/unindexed_directory_test.go

@@ -14,7 +14,6 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/scylladb/go-set/strset"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -1263,23 +1262,3 @@ func testWithTimeout(t *testing.T, timeout time.Duration, test func(*testing.T))
 	case <-done:
 	}
 }
-
-func compareLocations(t *testing.T, expected, actual []file.Location) {
-	t.Helper()
-	ignoreUnexported := cmpopts.IgnoreFields(file.LocationData{}, "ref")
-	ignoreMetadata := cmpopts.IgnoreFields(file.LocationMetadata{}, "Annotations")
-	ignoreFS := cmpopts.IgnoreFields(file.Coordinates{}, "FileSystemID")
-
-	sort.Sort(file.Locations(expected))
-	sort.Sort(file.Locations(actual))
-
-	if d := cmp.Diff(expected, actual,
-		ignoreUnexported,
-		ignoreFS,
-		ignoreMetadata,
-	); d != "" {
-
-		t.Errorf("unexpected locations (-want +got):\n%s", d)
-	}
-
-}