Create new HTTP2 transport modules (#1757)

Sources/GRPCHTTP2Core/README.md

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+# gRPC HTTP2 Core

Sources/GRPCHTTP2TransportNIOPosix/README.md

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+# gRPC HTTP2 Transport NIO POSIX

Sources/GRPCHTTP2TransportNIOTransportServices/README.md

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+# gRPC HTTP2 Transport NIO Transport Services

Tests/GRPCHTTP2CoreTests/GRPCHTTP2CoreTests.swift

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+/*
+ * Copyright 2024, gRPC Authors All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Add tests to this package.