[Toybox] [PATCH] date: add --iso and the %:z output format.

[enh]

I didn't know until implementing this that --iso is actually called
--iso-8601 and that GNU date will actually accept any prefix. --iso-8
works fine too. I've assumed that --iso (that I always used) and
--iso-8601 (as given in the documentation) are the only two that matter.
---
 tests/date.test   | 15 ++++++++++++
 toys/posix/date.c | 62 +++++++++++++++++++++++++++++++----------------
 2 files changed, 56 insertions(+), 21 deletions(-)
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