[Docs] Add Daniel Chen to committers list and GPG keys (apache#1578)

Changes
 - Add Daniel Chen to committers list and KEYS
 - Update Sanil's ordering conflict

KEYS

@@ -965,3 +965,51 @@ XgSlVbifAXWaMZr8kFpNF6H+zm6tZ3rclihqgWhUqrAAmT11qtMacbK8dRVw3im5
 oZPFXmvDQy/353sy1WRs
 =MLmR
 -----END PGP PUBLIC KEY BLOCK-----
+pub   rsa3072 2022-01-27 [SC] [expires: 2024-01-27]
+      476960AFB3211032634345091D9ADCE059431C34
+uid           [ultimate] Daniel Chen <[email protected]>
+sig 3        1D9ADCE059431C34 2022-01-27  Daniel Chen <[email protected]>
+sub   rsa3072 2022-01-27 [E] [expires: 2024-01-27]
+sig          1D9ADCE059431C34 2022-01-27  Daniel Chen <[email protected]>
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=cFjh
+-----END PGP PUBLIC KEY BLOCK-----

docs/_committers/daniel-chen.md

@@ -0,0 +1,28 @@
+---
+name: Daniel Chen
+website:
+linkedin: https://www.linkedin.com/in/dxichen
+twitter: dxichen
+image:
+github: dxichen
+pmc_member: false
+job_title:
+samza_title:
+order: 130
+---
+<!--
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You 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.
+-->

docs/_committers/sanil-jain.md

@@ -8,7 +8,7 @@ github: Sanil15
 pmc_member: false
 job_title:
 samza_title:
-order: 110
+order: 115
 ---
 <!--
    Licensed to the Apache Software Foundation (ASF) under one or more