[NO-ISSUE][GRAPHIX] Large Graphix update.

Large commit for the following:
- Using AbstractClauseExtension.
- LEFT-MATCH now defaults to a non-foldable-action.
- Refactor of some docstrings to use HTML lists.
- Starting work towards adding using SWITCH and CYCLE at Graphix.
- Adding support for implicit correlated vertex JOINs.
- Adding support for graphs with duplicate schema edge labels.
- Adding support for unconditional schema decoration.
- Adding support for negated edge labels.
- Total revamp for schema resolution: we now take an exhaustive approach.
- Adding support for specifying Graphix compiler options in the config file.

Change-Id: I120362128a5557f7de8904b86bacde3b606760db
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb-graph/+/17235
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Glenn Galvizo <ggalvizo@uci.edu>
diff --git a/asterix-graphix/src/main/resources/META-INF/services/org.apache.asterix.om.functions.IFunctionRegistrant b/asterix-graphix/src/main/resources/META-INF/services/org.apache.asterix.om.functions.IFunctionRegistrant
new file mode 100644
index 0000000..5ee5a83
--- /dev/null
+++ b/asterix-graphix/src/main/resources/META-INF/services/org.apache.asterix.om.functions.IFunctionRegistrant
@@ -0,0 +1,20 @@
+#
+# 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.
+#
+
+org.apache.asterix.graphix.runtime.function.GraphixFunctionRegistrant
\ No newline at end of file