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/directory_indexer.go

@@ -7,7 +7,6 @@ import (
 	"os"
 	"path"
 	"path/filepath"
-	"runtime"
 	"strings"
 
 	"github.com/wagoodman/go-partybus"
@@ -19,6 +18,7 @@ import (
 	"github.com/anchore/syft/internal/bus"
 	"github.com/anchore/syft/internal/log"
 	"github.com/anchore/syft/syft/event"
+	"github.com/anchore/syft/syft/internal/windows"
 )
 
 type PathIndexVisitor func(string, os.FileInfo, error) error
@@ -263,8 +263,8 @@ func (r *directoryIndexer) indexPath(path string, info os.FileInfo, err error) (
 	}
 
 	// here we check to see if we need to normalize paths to posix on the way in coming from windows
-	if runtime.GOOS == WindowsOS {
-		path = windowsToPosix(path)
+	if windows.HostRunningOnWindows() {
+		path = windows.ToPosix(path)
 	}
 
 	newRoot, err := r.addPathToIndex(path, info)