Added reactor-grpc v1.2.4 (bufbuild#701)

plugins/community/salesforce-reactive-grpc-java/source.yaml

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+source:
+  github:
+    owner: salesforce
+    repository: reactive-grpc

plugins/community/salesforce-reactive-grpc-java/v1.2.4/.dockerignore

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+*
+!Dockerfile

plugins/community/salesforce-reactive-grpc-java/v1.2.4/Dockerfile

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+FROM adoptopenjdk/openjdk11:jre-11.0.20_8-debianslim
+ARG LOCATION_PREFIX="https://repo1.maven.org/maven2/com/salesforce/servicelibs/reactor-grpc/1.2.4/reactor-grpc-1.2.4-"
+ARG PLUGIN_NAME=protoc-gen-reactor-grpc
+
+RUN apt-get update && apt-get upgrade -y && apt-get install -y wget
+RUN case $(uname -m) in "aarch64") echo linux-aarch_64 ;; "x86_64") echo linux-x86_64;; esac >arch.txt
+RUN wget -O ${PLUGIN_NAME} ${LOCATION_PREFIX}$(cat arch.txt).exe
+RUN chmod 0755 ${PLUGIN_NAME}
+USER 65534
+CMD ./protoc-gen-reactor-grpc

plugins/community/salesforce-reactive-grpc-java/v1.2.4/buf.plugin.yaml

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+version: v1
+name: salesforce-reactive-grpc-java
+plugin_version: v1.2.4
+source_url: https://github.com/salesforce/reactive-grpc
+description: Reactor gRPC generator
+output_languages:
+  - java
+spdx_license_id: BSD-3-Clause
+license_url: https://github.com/salesforce/reactive-grpc/blob/v1.2.4/LICENSE