TurboModule Android: compile TurboModule C++ Core into ReactAndroid

Summary:
This is to prepare for enabling TurboModule on Android. This commit compiles in all the core files (C++) into the ReactAndroid NDK build step. This doesn't yet enable TurboModule by default, just compiling in the infra, just like for iOS.

New shared libs:
* libreact_nativemodule_core.so: The TurboModule Android core
* libreact_nativemodule_manager.so: The TurboModule manager/delegate

To be compatible with `<ReactCommon/` .h include prefix, the files had to move to local `ReactCommon` subdirs.

Changelog: [Internal]

Reviewed By: sammy-SC

Differential Revision: D23805717

fbshipit-source-id: b41c392a592dd095ae003f7b2a689f4add2c37a9

ReactCommon/react/nativemodule/core/ReactCommon/TurboModule.cpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "TurboModule.h"
+
+using namespace facebook;
+
+namespace facebook {
+namespace react {
+
+TurboModule::TurboModule(
+    const std::string &name,
+    std::shared_ptr<CallInvoker> jsInvoker)
+    : name_(name), jsInvoker_(jsInvoker) {}
+
+TurboModule::~TurboModule() {}
+
+jsi::Value TurboModule::get(
+    jsi::Runtime &runtime,
+    const jsi::PropNameID &propName) {
+  std::string propNameUtf8 = propName.utf8(runtime);
+  auto p = methodMap_.find(propNameUtf8);
+  if (p == methodMap_.end()) {
+    // Method was not found, let JS decide what to do.
+    return jsi::Value::undefined();
+  }
+  MethodMetadata meta = p->second;
+  return jsi::Function::createFromHostFunction(
+      runtime,
+      propName,
+      meta.argCount,
+      [this, meta](
+          facebook::jsi::Runtime &rt,
+          const facebook::jsi::Value &thisVal,
+          const facebook::jsi::Value *args,
+          size_t count) { return meta.invoker(rt, *this, args, count); });
+}
+
+} // namespace react
+} // namespace facebook