Bp2build support for sdk_version and java_version.

This CL adds java_version and sdk_version support to bp2build
converters for
   - java library
   - java binary
   - android library
   - android binary
   - android library import

Although java import doesn't support java_version and sdk_version, the
neverlink java_library wrapper around a java_import must specify a
sdk_version when targetting a device. "none" is used by convention.

Change-Id: I22a69dea2e351858368df69ed6a703b568d613ea
Bug: 215230098
Test: Presubmits
diff --git a/bp2build/testing.go b/bp2build/testing.go
index 856b6ee..6e919db 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -642,10 +642,14 @@
 }
 
 func MakeNeverlinkDuplicateTarget(moduleType string, name string) string {
-	return MakeBazelTarget(moduleType, name+"-neverlink", AttrNameToString{
-		"neverlink": `True`,
-		"exports":   `[":` + name + `"]`,
-	})
+	return MakeNeverlinkDuplicateTargetWithAttrs(moduleType, name, AttrNameToString{})
+}
+
+func MakeNeverlinkDuplicateTargetWithAttrs(moduleType string, name string, extraAttrs AttrNameToString) string {
+	attrs := extraAttrs
+	attrs["neverlink"] = `True`
+	attrs["exports"] = `[":` + name + `"]`
+	return MakeBazelTarget(moduleType, name+"-neverlink", attrs)
 }
 
 func getTargetName(targetContent string) string {