[gluon] initial integration (#10170)

[Gluon](https://github.com/ProtonMail/gluon) is used by
[ProtonMail](https://proton.me/mail).
PR for fuzzing harness: https://github.com/ProtonMail/gluon/pull/341

---------

Signed-off-by: Arjun Singh <ajsinghyadav00@gmail.com>

projects/gluon/Dockerfile

@@ -0,0 +1,21 @@
+# Copyright 2023 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-go
+RUN git clone --depth 1 https://github.com/ProtonMail/gluon.git
+RUN go install github.com/AdamKorcz/go-118-fuzz-build@latest
+COPY build.sh $SRC/
+WORKDIR $SRC/gluon

projects/gluon/build.sh

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+#!/bin/bash -eu
+# Copyright 2023 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.
+#
+################################################################################
+
+go get github.com/AdamKorcz/go-118-fuzz-build/testing
+
+compile_native_go_fuzzer github.com/ProtonMail/gluon/imap       FuzzNewParsedMessage    fuzz_new_parsed_message
+compile_native_go_fuzzer github.com/ProtonMail/gluon/rfc5322    FuzzParseAddress        fuzz_parse_address
+compile_native_go_fuzzer github.com/ProtonMail/gluon/rfc5322    FuzzRFC5322             fuzz_rfc5322
+compile_native_go_fuzzer github.com/ProtonMail/gluon/rfc822     FuzzParseDec            fuzz_parse_dec

projects/gluon/project.yaml

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+homepage: "https://proton.me"
+language: go
+primary_contact: "security@proton.me"
+auto_ccs:
+  - "ajsinghyadav00@gmail.com"
+fuzzing_engines:
+  - libfuzzer
+sanitizers:
+  - address
+main_repo: "https://github.com/ProtonMail/gluon"