chore: Parallelize Tests

This will use all available cores to run tests, and parallelize by all - suite/class/method.
On machines with multiple cores, this will vastly improve test performance.
These times are on my M1 MBP with 10 (8P + 2E) cores. They were reported by maven on running `mvn verify`.

I first ran `mvn verify` and ignored the time.
Then I ran it thrice without this change, and thrice with this change.

All times in seconds.

|        | Run 1 | Run 2 | Run 3 | Average |
| ------ | ----: | ----: | ----: | ------: |
| Before |    29 |    30 |    29 |      29 |
| After  |    17 |    17 |    17 |      17 |
| Savings|       |       |       |      12 |
| %      |       |       |       |      41 |

pom.xml

@@ -100,5 +100,18 @@
         </dependency>
 
     </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <forkCount>1C</forkCount>
+                    <parallel>all</parallel>
+                    <useUnlimitedThreads>true</useUnlimitedThreads>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
 </project>