Tokenized trace, implements trace events by tokenizing all compile time
information of the event into a 32bit number (using tokenizer module).
This CL just adds the encoding of trace events and callback hooks,
buffering which usies the callback will be added in a future CL.
Test: passes included test
Change-Id: Ibfcc34211c09965af8da030e28dba5e8f7c6ccdb
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/11428
Commit-Queue: Rob Oliver <rgoliver@google.com>
Reviewed-by: (☞ﾟ∀ﾟ)☞ Tennessee Carmel-Veilleux <tennessee@google.com>
Reviewed-by: Keir Mierle <keir@google.com>
