chore: Parallelize Tests (#197)

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 |   876 |   873 |   878 |     876 |
| After  |   300 |   300 |   301 |     300 |
| Savings|       |       |       |     576 |
| %      |       |       |       |      66 |

Co-authored-by: Name From Git-Plugin-Test <email.from.git.plugin.test@example.com>

pom.xml

@@ -44,6 +44,15 @@
             <compatibleSinceVersion>1.44</compatibleSinceVersion>
           </configuration>
         </plugin>
+      <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>