Refactor fileresolver to not require base path (#4298)

* ref: close source in test and examples

Signed-off-by: Kudryavcev Nikolay <kydry.nikolau@gmail.com>

* ref: pretty file/directory source resolver (make them more similar)

Signed-off-by: Kudryavcev Nikolay <kydry.nikolau@gmail.com>

* ref: move absoluteSymlinkFreePathToParent to file resolver

Signed-off-by: Kudryavcev Nikolay <kydry.nikolau@gmail.com>

* revert breaking change

Signed-off-by: Kudryavcev Nikolay <kydry.nikolau@gmail.com>

---------

Signed-off-by: Kudryavcev Nikolay <kydry.nikolau@gmail.com>

examples/create_custom_sbom/main.go

@@ -23,6 +23,7 @@ const defaultImage = "alpine:3.19"
 func main() {
 	// automagically get a source.Source for arbitrary string input
 	src := getSource(imageReference())
+	defer src.Close()
 
 	// will catalog the given source and return a SBOM keeping in mind several configurable options
 	sbom := getSBOM(src)
@@ -46,7 +47,6 @@ func getSource(input string) source.Source {
 	fmt.Println("detecting source type for input:", input, "...")
 
 	src, err := syft.GetSource(context.Background(), input, nil)
-
 	if err != nil {
 		panic(err)
 	}