[Toybox] [PATCH] id: support numeric lookup.

[enh]

Fall back to converting the "name" to an integer and calling getpwuid().
We need to update `username` for the later call to getgrouplist().

Also fix the separator printing logic to avoid a trailing ',' on `id 0`.

Switch to FLAG() and move some declarations down to where they can be
initialized, both for clarity.

Also add simple tests. Sadly, there's no always-present user that is in
multiple groups.
---
 tests/id.test   | 10 ++++++++++
 toys/posix/id.c | 49 ++++++++++++++++++++++++++-----------------------
 2 files changed, 36 insertions(+), 23 deletions(-)
 create mode 100755 tests/id.test
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