Adds support for multi-event selection if JFR is enabled

[6fears7]

Created new builder option: setProfilingEvents

Most notably in Profiler.java, the createJFRCommand ensures that only when the JFR option is enabled will multiple events be used. Otherwise, it'll default to the single Event default set in the Config.

private String createJFRCommand() {
        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < eventTypes.length; i++) {
            if (i == 0) {
                sb.append("start,event=").append(eventTypes[0].id);
            } else {
                sb.append(",").append(eventTypes[i].id);
            }

        }

Enables end users to utilize the Config Builder to specify multiple event types to mirror the async-profilers command line options

I dig a lot of digging and didn't see any current way in-code for this to work, so if there is and it's simply hidden please let me know.

[korniltsev]

io.pyroscope.javaagent.config.Config.Builder#setProfilingLock

[6fears7]

Thank you. I was much too focused on getting the method # 1 to work (./profiler.sh -e cpu,alloc,lock -f profile.jfr ...) that I didn't pay any mind to method # 2 (./profiler.sh -e cpu --alloc 2m --lock 10ms -f profile.jfr ...) and how that might've already been used in the Builder