Add beacon.watch (#3362)

> This is currently a WIP and all features are subject to alteration or removal at any time.

## Overview

The successor to #2873.

Contains the backbone of `beacon.watch` including syncing code, the initial API, and several core database tables.

See `watch/README.md` for more information, requirements and usage.

watch/src/logger.rs

@@ -0,0 +1,24 @@
+use env_logger::Builder;
+use log::{info, LevelFilter};
+use std::process;
+
+pub fn init_logger(log_level: &str) {
+    let log_level = match log_level.to_lowercase().as_str() {
+        "trace" => LevelFilter::Trace,
+        "debug" => LevelFilter::Debug,
+        "info" => LevelFilter::Info,
+        "warn" => LevelFilter::Warn,
+        "error" => LevelFilter::Error,
+        _ => {
+            eprintln!("Unsupported log level");
+            process::exit(1)
+        }
+    };
+
+    let mut builder = Builder::new();
+    builder.filter(Some("watch"), log_level);
+
+    builder.init();
+
+    info!("Logger initialized with log-level: {log_level}");
+}