Respect user preferences when formatting timestamp (#7994)

This is a follow up to #7945. The current behaviour reads the locale and
infers from that which type of time format should be used (12 hour/24
hour).
However, in macOS you can override this behaviour, e.g. you can use
en_US locale but still use the 24 hour clock format (Can be customized
under Settings > General > Date & Format > 24-hour time). You can even
customize the date format.

This PR uses the macOS specific `CFDateFormatter` API, which outputs
time format strings, that respect those settings.

Partially fixes #7956 (as its not implemented for linux)

Release Notes:

- Added localization support for all macOS specific date and time
configurations in chat

crates/time_format/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "time_format"
+version = "0.1.0"
+edition = "2021"
+publish = false
+license = "GPL-3.0-or-later"
+
+[lib]
+path = "src/time_format.rs"
+doctest = false
+
+[dependencies]
+anyhow.workspace = true
+lazy_static.workspace = true
+sys-locale.workspace = true
+time.workspace = true
+util.workspace = true
+
+[target.'cfg(target_os = "macos")'.dependencies]
+core-foundation.workspace = true
+core-foundation-sys.workspace = true