new/delete operator macro hooks

[sagaceilo]

Some loose idea.

We have this new-delete include file that implements all possible functions. Would be cool to add some macros inside, that by default would map to nothing but allow to define them before including header and hook calls to Tracy for example ( TracyAlloc(ptr, size) TracyFree(ptr) etc ).
This way users would not need to write custom new/delete overrides and updating Mimalloc will not override any such custom modyficatjons in this file.