spotify-json: initial integration. (#5014)

* spotify json: initial integration.

* Updated the spotify-json library to reflect upstream fuzzer merge.

projects/spotify-json/Dockerfile

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+# Copyright 2021 Google LLC
+#
+# 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.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder
+RUN git clone https://github.com/spotify/spotify-json
+
+WORKDIR $SRC/spotify-json
+COPY build.sh $SRC/

projects/spotify-json/build.sh

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+#!/bin/bash -eu
+# Copyright 2021 Google LLC
+#
+# 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.
+#
+################################################################################
+
+mkdir build && cd build
+cmake -DSPOTIFY_JSON_BUILD_TESTS=OFF ../
+make
+
+$CXX $CXXFLAGS $LIB_FUZZING_ENGINE ../fuzzers//fuzz_decode.cpp \
+    -I../include -I../vendor/double-conversion \
+    ./libspotify-json.a ./vendor/double-conversion/libdouble-conversion.a  -lpthread -o $OUT/fuzz_decode

projects/spotify-json/project.yaml

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+homepage: "https://github.com/spotify/spotify-json"
+main_repo: 'https://github.com/spotify/spotify-json'
+primary_contact: "johanl@spotify.com"
+language: c++
+auto_ccs:
+  - "david@adalogics.com"