NCS-59 Create Load tests (#2)

Added a load test and and slight change in structure. To execute type:

Run the load test:
  ./gradlew.bat gatlingRun --simulation simulations.LoadTestSimulation -PbaseUrl=https://st.nowchess.janis-eccarius.de
  -PauthToken=<token> -PmaxUsers=20 -PrampDuration=60

  Run smoke test:
  ./gradlew.bat gatlingRun --simulation simulations.SmokeTestSimulation -PbaseUrl=https://st.nowchess.janis-eccarius.de
  -PauthToken=<token>

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Co-authored-by: LQ63 <lkhermann@web.de>
Reviewed-on: #2
Reviewed-by: Janis <janis-e@gmx.de>

build.gradle

@@ -19,7 +19,10 @@ tasks.withType(io.gatling.gradle.GatlingRunTask) {
     jvmArgs = [
         '--add-opens=java.base/java.lang=ALL-UNNAMED',
         "-Dtarget.baseUrl=${findProperty('baseUrl') ?: 'http://localhost:8080'}",
-        "-Dgatling.authToken=${findProperty('authToken') ?: System.getenv('GATLING_AUTH_TOKEN') ?: ''}"
+        "-Dgatling.authToken=${findProperty('authToken') ?: System.getenv('GATLING_AUTH_TOKEN') ?: ''}",
+        "-Dhealthz.path=${findProperty('healthzPath') ?: '/health'}",
+        "-DmaxUsers=${findProperty('maxUsers') ?: '10'}",
+        "-DrampDuration=${findProperty('rampDuration') ?: '60'}"
     ]
 }