Add programming support for tracepoints

The aim is to provide a library that allows adding tracepoints to mongo servers. The primary intent for these tracepoints is to collect timing information (e.g., using ServiceContext::getFastClockSource) for an ongoing operation. The tracepoints must compile to a noop by default, unless requested otherwise at compile time.

The following is a possible/suggested API design for the tracepoints.

void someFunction() {

    // TracePoint(std::string name, Duration<T> loggingThreshold);

    auto tp = makeTracepoint("MyTracepoint", Milliseconds(100));

    runOperationA();

    tp.checkpoint("Checkpoint 1");

    runOperationB();

}

When enabled, the tracepoint must collect the timestamp at construction and at each checkpoint, and log the timestamps when the lifetime of the tracepoint object exceeds a threshold.

For example, if running runOperationA and runOperationB takes more than 100 milliseconds, we expect to see a line similar to the following in mongo logs:

{ "Tracepoint exceeded its expected lifetime" , "attr": {"name": "MyTracepoint", "constructedAt": "timestamp", "destroyedAt": "timestamp", "Checkpoint 1": "timestamp", "expectedLifetimeMS": 100, "observedLifetimeMS": 101} }

Acceptance criteria:

• For the first pass, someone will do a POC timeboxed at 2 story points to answer some of the open questions