[feat] explore way for tags to be bound to a thread

[ptrthomas]

based on question here, and this ask has come up a few times: https://stackoverflow.com/q/75083053/143475

Also there is a related discussion (can't find the link) if we could force some tag to be the test that starts the suite etc. today, this is the domain of karate.callSingle()

in summary, it would be cool if we could say that

• certain tags have to run only on one thread
• certain tags should run at the start of the test
• certain tags should block everything else