Add strformat support for Complex numbers (#22924)

Before this change strformat used the generic formatValue function for
Complex numbers. This meant that it was not possible to control the
format of the real and imaginary components of the complex numbers.

With this change this now works:
```nim
import std/[complex, strformat]
let c = complex(1.05000001, -2.000003)
echo &"{c:g}"
# You now get: (1.05, -2)
# while before you'd get a ValueError exception (invalid type in format string for string, expected 's', but got g)
```

The only small drawback of this change is that I had to import complex
from strformat. I hope that is not a problem.

---------

Co-authored-by: Angel Ezquerra <angel_ezquerra@keysight.com>

0 files changed, 0 insertions, 0 deletions