refactor: shorten log time format (jtroo#1011)

Shorten logged time format.

`time` crate needs to be added to Cargo.toml excplicitly, otherwise
`format_description` gives an error.

Before vs after:
```
2024-05-04T17:07:38.975459272+02:00 [INFO] config file is valid
17:07:59.8868 [INFO] config file is valid
```

Cargo.toml

@@ -48,6 +48,7 @@ radix_trie = "0.2"
 rustc-hash = "1.1.0"
 simplelog = "0.12.0"
 serde_json = { version = "1", features = ["std"], default_features = false, optional = true }
+time = "0.3.36"
 
 # kanata-keyberon = "0.161.0"
 # kanata-parser = "0.161.0"

src/main.rs

@@ -3,8 +3,7 @@ use clap::Parser;
 use kanata_parser::cfg;
 use kanata_state_machine::*;
 use log::info;
-use simplelog::*;
-
+use simplelog::{format_description, *};
 use std::path::PathBuf;
 
 #[cfg(test)]
@@ -117,7 +116,10 @@ fn cli_init() -> Result<ValidatedArgs> {
     if let Err(e) = log_cfg.set_time_offset_to_local() {
         eprintln!("WARNING: could not set log TZ to local: {e:?}");
     };
-    log_cfg.set_time_format_rfc3339();
+    log_cfg.set_time_format_custom(format_description!(
+        version = 2,
+        "[hour]:[minute]:[second].[subsecond digits:4]"
+    ));
     CombinedLogger::init(vec![TermLogger::new(
         log_lvl,
         log_cfg.build(),