Add GraalSystems (apache#23651)

Co-authored-by: Vincent Devillers <>

website/www/site/content/en/case-studies/graalsystems.md

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+---
+title:  "GraalSystems"
+icon: /images/logos/powered-by/graalsystems.png
+hasNav: true
+cardDescription: "GraalSystems is a cloud native data platform providing support for Beam, Spark, Tensorflow, Samza and many other data processing solutions. At the heart of our architecture are a set of distributed processing and analytics modules using Beam to route over 2 billion events per day from our Apache Pulsar clusters. For our clients, we run also more than 2,000 Beam jobs per day at a very large scale in our production platform."
+---
+<!--
+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.
+-->
+
+**[GraalSystems](https://graal.systems)** is a cloud native data platform providing support for Beam, Spark, Tensorflow, Samza and many other data processing solutions. At the heart of our architecture are a set of distributed processing and analytics modules using Beam to route over 2 billion events per day from our Apache Pulsar clusters. For our clients, we run also more than 2,000 Beam jobs per day at a very large scale in our production platform