[Toybox] new toy: logger

[Ilya Kuzmich]

Implements -t -p ans -s. Same functionality as busybox logger sans
numeric facility. Do we really need this?

There is one sublte corner case though:
logger "", logger "" "", or even logger </dev/null
gnu silently ignores all of them
busybox logs logger "" and logger "" "", but ignores logger </dev/null
this toy logs them all
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