bp2build support for stem

By default, the artifacts generated by cc_binary and cc_library in Soong
track the module name. But Soong supports overidding this using the stem
property. e.g.
```
cc_library {
  name: "foo.1.2",
  stem: "foo",
}
```
will generate foo.so

This CL adds this property to bp2build

Test: bp2build unit tests
Bug: 240563612
Change-Id: I1dfed870d5bad450511b72c397d2355c01fa3b60
diff --git a/cc/bp2build.go b/cc/bp2build.go
index 34cc574..1e83ca3 100644
--- a/cc/bp2build.go
+++ b/cc/bp2build.go
@@ -434,6 +434,7 @@
 
 	features bazel.StringListAttribute
 
+	stem   bazel.StringAttribute
 	suffix bazel.StringAttribute
 
 	fdoProfile bazel.LabelAttribute
@@ -819,6 +820,9 @@
 						compilerAttrs.stubsVersions.SetSelectValue(axis, cfg, versions)
 					}
 				}
+				if stem := libraryProps.Stem; stem != nil {
+					compilerAttrs.stem.SetSelectValue(axis, cfg, stem)
+				}
 				if suffix := libraryProps.Suffix; suffix != nil {
 					compilerAttrs.suffix.SetSelectValue(axis, cfg, suffix)
 				}
@@ -1737,6 +1741,7 @@
 
 type binaryLinkerAttrs struct {
 	Linkshared *bool
+	Stem       bazel.StringAttribute
 	Suffix     bazel.StringAttribute
 }
 
@@ -1754,6 +1759,9 @@
 			// nonconfigurable attribute. Only 4 AOSP modules use this feature, defer handling
 			ctx.ModuleErrorf("bp2build cannot migrate a module with arch/target-specific static_executable values")
 		}
+		if stem := linkerProps.Stem; stem != nil {
+			attrs.Stem.SetSelectValue(axis, config, stem)
+		}
 		if suffix := linkerProps.Suffix; suffix != nil {
 			attrs.Suffix.SetSelectValue(axis, config, suffix)
 		}