[llvm] [llvm]Add a simple Telemetry framework (PR #102323)

[Vy Nguyen via llvm-commits]

oontvoo wrote:

@jh7370 W.R.T your concern about not having a concrete implementation (or end-to-end tests) , I Just wanted to point out  in a separate thread (in case the other comments got buried) that there *is* one in LLDB (See patch [here](https://github.com/llvm/llvm-project/pull/98528)  ). 

It was originally part of this patch but I was asked to split up the LLVM abstract pieces out to help reviewing easier.

I believe the LLDB patch (which will have tests, both unit test and lit test) should be sufficient (after all, this whole project was original proposed for LLDB - there is no other users yet, which is why I did not see the point of trying to make a concrete implementation purely for testing sake)

https://github.com/llvm/llvm-project/pull/102323