Beta release of ClockBound 3.0

Added

* The `clockbound` daemon accepts an optional TOML configuration file via `-c`/`--configuration`. Without one, the
  daemon runs on built-in defaults and logs to stdout only. See `assets/example-config.toml` for a documented example.
* Added `--check-configuration`, which loads and validates the file passed with `-c`, reports whether it is usable, and
  exits without starting the daemon.
* Added `-v`/`--verbose` to raise the stdout log level from info to debug.
* Configurable log streams written to the configured log directory: `sync.log`, a human-readable clock synchronization
  history snapshotted every minute, and `ffevents.log`, raw sync data for deterministic expert replay analysis. The daemon
  reopens its log files on `SIGHUP` to support log rotation.
* Additional NTP sources can be supplied in the configuration file alongside the built-in ones, specified as an
  individual `server` (IPv4, IPv6, or hostname) or as a `pool` hostname that resolves to several servers. DNS pools are
  resolved and their member hosts tracked at runtime.
* Added a new `cbctl` command-line utility. `cbctl waitsync` blocks until the clock is synchronized

Changed

* Replaced the `--log-dir` CLI parameter with `-c`/`--configuration`. A configuration that cannot be read, parsed, or
  validated is reported and the daemon exits with a non-zero exit code.
* Instance-type detection now uses local DMI data instead of an IMDS lookup
* EC2 time sync sources are installed based off platform auto-detection. No configuration necessary
* Renamed `tsc` to `counter` in logs.
* Reduced the size of the `clockbound` binary through release profile settings.