### Feature and motivation

Be able to link custom OpenTelemetry tracing with the default Selenium grid tracing. See for e.g. https://github.com/llatinov/selenium-observability-java/blob/324b500316be34f5f1426720353d0c4e2e8b5a89/selenium-tests/src/main/java/com/automationrhapsody/observability/TracingWebDriver.java#L81 
It will be useful if I am able to pass my Span as a parent span of Selenium's RemoteWebDriver tracing, so I can trace my actions with corresponding grid actions.

### Usage example

Implement a custom tracing that monitors the tests. It will be of great help to be able to make the default server/grid tracing a child of the custom tracking. In this case, users can monitor how a click of a button in their tests links to grid performance.
attributes.put("testBooleanArray", booleanArray);
    try (Span span = tracer.getCurrentContext().createSpan("parent")) {
      Map<String, EventAttributeValue> attributeMap = new HashMap<>();
      attributeMap.put("testFloat", EventAttribute.setValue(5.5f));
      attributeMap.put("testInt", EventAttribute.setValue(10));
      attributeMap.put("testStringArray", EventAttribute.setValue(stringArray));
      attributeMap.put("testBooleanArray", EventAttribute.setValue(booleanArray));
      span.addEvent(event, attributeMap);
    }
    assertThat(allSpans).hasSize(1);
    SpanData spanData = allSpans.get(0);
    assertThat(spanData.getEvents()).hasSize(1);
    List<EventData> timedEvents = spanData.getEvents();
    assertThat(timedEvents).element(0).extracting(EventData::getName).isEqualTo(event);
    assertThat(timedEvents.get(0).getAttributes()).isEqualTo(attributes.build());
  }
  @Test
  public void nestingSpansInTheSameThreadShouldWork() {
    List<SpanData> allSpans = new ArrayList<>();
    Tracer tracer = createTracer(allSpans);
    try (Span parent = tracer.getCurrentContext().createSpan("parent")) {
      try (Span child = parent.createSpan("child")) {
        child.setAttribute("cheese", "camembert");
      }
    }
    SpanData parent = allSpans.stream().filter(data -> data.getName().equals("parent"))
        .findFirst().orElseThrow(NoSuchElementException::new);
    SpanData child = allSpans.stream().filter(data -> data.getName().equals("child"))
        .findFirst().orElseThrow(NoSuchElementException::new);
    assertThat(child.getParentSpanId()).isEqualTo(parent.getSpanId());