provide compiler hooks to customize compilation [cf EMAIL:In language tooling]

[Timothee Cour via Digitalmars-d]

one takeaway from the video in [EMAIL:In language tooling] that would be
doable in D with a compiler as a library:

we could provide hooks (via user defined function delegates) in the
compiler when some action happen, eg: opening a file to be compiled,
parsing an import, processing an expression etc.

This would allow for example writing user defined callbacks
to interactively visualize on a webserver the number of
[files,functions,symbols,LOC, mixin expansions, CTFE execution] being
compiled in realtime, warn when a file about to be compiled doesn't match
some regular expression, and many other use cases (see video)
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