Add info logging via callback to C api. #12537
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I'd like to get this in so the Rust folks can integrate with their splendid logging/tracing frameworks; will be hugely appreciated. 馃檹馃徎
Summary:
The infolog capabilities for C embeddings are quite spartan. LOG files were generated involuntarily until redirection to stderr was added by #12262; still insufficient for apps which cannot tolerate pollution of their stdio and tend to have existing logging frameworks to tie into for that.
Adds a very minimal derive of Logger around a C callback, written in the spirit, useful for FFI interfaces from other languages to integrate infolog.