[llvm] [llvm][lib]Propose a simple Telemetry framework. (PR #102323)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

some nits:

just `[llvm]` is enough in the commit title, no need for `[lib]`
this PR isn't `Propose`ing, it's adding
commit titles should not end with a period

I think I'm missing the background to properly review this for 

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