[Benchmark] Add dummy benchmark

Add a dummy benchmark for testing the benchmarking script.  This will
later be used in CI to ensure our benchmarking didn't break.

benchmark/dummy/data/dummy.csv

@@ -0,0 +1,4 @@
+id,val
+0,3.14
+1,13.37
+2,42.42

benchmark/dummy/data/schema.sql

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+CREATE DATABASE dummy;
+USE dummy;
+
+CREATE TABLE Dummy (
+    id INT(4) NOT NULL,
+    val FLOAT
+);

benchmark/dummy/dummy.yml

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+description: Dummy benchmark used in CI to ensure benchmarking works
+suite: dummy
+benchmark: dummy
+name: Dummy
+readonly: true
+data:
+    'Dummy':
+        attributes:
+            'id': 'INT NOT NULL'
+            'val': 'FLOAT NOT NULL'
+        file: 'benchmark/dummy/data/dummy.csv'
+        format: 'csv'
+        delimiter: ','
+        header: 1
+systems:
+    mutable:
+        configurations:
+            'WasmV8, PAX4M':
+                args: --backend WasmV8 --data-layout PAX4M
+                pattern: '^Execute query:.*'
+        cases:
+            'Dummy': SELECT * FROM Dummy;
+    PostgreSQL:
+        cases:
+            'Dummy': SELECT * FROM "Dummy";
+    DuckDB:
+        cases:
+            'Dummy': SELECT * FROM "Dummy";
+    HyPer:
+        cases:
+            'Dummy': SELECT * FROM "Dummy";