Change Python in Soong to support device side build.

Add python_test to generate executables for both host and device side.
And change python_library_host to python_library.

installation for python device test will be under
target/product/generic_arm[64]/data/nativetest[64].

Bug: b/69114465
Test: m clean && m -j
Device Test:
adb root; adb push nan_devicetest /data;
adb shell; ./nan_devicetest
print(sys.path)
['/data/nan_devicetest/runfiles', '/data/nan_devicetest', '/data/nan_devicetest/internal', '/data/nan_devicetest/internal/stdlib']

Change-Id: If8317070a3aa1b6dab2e84b8df2d037f495d7247

python/binary.go

@@ -49,24 +49,20 @@ type BinaryProperties struct {
 type binaryDecorator struct {
 	binaryProperties BinaryProperties
 
-	baseInstaller *pythonInstaller
+	*pythonInstaller
 }
 
 type IntermPathProvider interface {
 	IntermPathForModuleOut() android.OptionalPath
 }
 
-func (binary *binaryDecorator) install(ctx android.ModuleContext, file android.Path) {
-	binary.baseInstaller.install(ctx, file)
-}
-
 var (
 	stubTemplateHost = "build/soong/python/scripts/stub_template_host.txt"
 )
 
 func NewBinary(hod android.HostOrDeviceSupported) (*Module, *binaryDecorator) {
 	module := newModule(hod, android.MultilibFirst)
-	decorator := &binaryDecorator{baseInstaller: NewPythonInstaller("bin")}
+	decorator := &binaryDecorator{pythonInstaller: NewPythonInstaller("bin", "")}
 
 	module.bootstrapper = decorator
 	module.installer = decorator