Allow the function name to be included in the log output

[jfilby]

This would help to understand how the log output relates to the program structure (faster).

[zah]

Chronicles already has a somewhat similar mechanism that adds file name and line number information to each logged line. It's enabled by compiling your code with -d:chronicles_line_numbers:on

[jfilby]

The filename and line number is not nearly enough, especially for large files. It makes following the flow of logging more time consuming without the function name.

[zah]

There are some suggestions for how the name of the function can be obtained in the following discussion:
nim-lang/Nim#8212

The required changes in Chronicles wouldn't be very complicated if one uses chronicles_line_numbers as a model.

[ringabout]

Related:
nim-lang/Nim#17640