feat(fun/🕰️): get the time as an emoji clock face

This small tool prints the current time rounded to half-hour precision
as an emoji clock face and exists. It can use both the local time zone
and UTC. Additionally it supports a pseudo dot time format.

Via fun.🕰️.lib we reexpose the internal library which allows conversion
from LOCAL-TIME:TIMESTAMP to an emoji clock face — maybe we'll want to
integrate this into //web/panettone?

//fun/🕰️ is the spritual (and actual) successor to
<https://github.com/sternenseemann/unicode_clock>.

It likely only works in SBCL due to its heavy usage of unicode symbol
names.

Change-Id: I44204107a14f99b04b0c5290d88e8659f013f423
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3164
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

fun/🕰️/OWNERS

@@ -0,0 +1,3 @@
+inherited: true
+owners:
+  - sterni