feat(analyzer): enhance analyzer cli and logging (#1507)

Some initial work on modernizing the analyzer app. This replace any custom logger or `logging` based logger with the logging tools from `libretime_shared.logging` and `loguru`.

- rename cli to main
- use pathlib in setup.py
- add api-client and shared package as dev deps
- rework main entrypoint cli to use click and shared helpers
- remove unused imports
- replace logging with logger
- rework analyzer app using shared abstract app
- move analyzer log path to systemd service
- change analyzer working dir

BREAKING CHANGE: The analyzer cli has been reworked and uses new flags / environnement variables for configuration.
`--debug` flag becomes `--log-level <level>`
`--rmq-config-file` flag becomes `--config <filepath>`
`--http-retry-queue-file` flag becomes `--retry-queue-filepath`.
`retry-queue-filepath` default value changed from `/tmp/airtime_analyzer_http_retries` to `retry_queue` in the working dir.
`LIBRETIME_CONF_DIR` environnement variable replaced by `LIBRETIME_CONFIG_FILEPATH`.

BREAKING CHANGE: When running analyzer as a systemd service, the working directory is now /var/lib/libretime/analyzer.

analyzer/libretime_analyzer/main.py

@@ -0,0 +1,69 @@
+from pathlib import Path
+from typing import Optional
+
+import click
+from libretime_shared.app import AbstractApp
+from libretime_shared.cli import cli_config_options, cli_logging_options
+from libretime_shared.config import DEFAULT_ENV_PREFIX
+
+from .config_file import read_config_file
+from .message_listener import MessageListener
+from .status_reporter import StatusReporter
+
+VERSION = "1.0"
+
+DEFAULT_LIBRETIME_CONFIG_FILEPATH = Path("/etc/airtime/airtime.conf")
+DEFAULT_RETRY_QUEUE_FILEPATH = Path("retry_queue")
+
+
+@click.command()
+@cli_logging_options
+@cli_config_options
+@click.option(
+    "--retry-queue-filepath",
+    envvar=f"{DEFAULT_ENV_PREFIX}_RETRY_QUEUE_FILEPATH",
+    type=click.Path(path_type=Path),
+    help="Path to the retry queue file.",
+    default=DEFAULT_RETRY_QUEUE_FILEPATH,
+)
+def cli(
+    log_level: str,
+    log_filepath: Optional[Path],
+    config_filepath: Optional[Path],
+    retry_queue_filepath: Path,
+):
+    """
+    Run analyzer.
+    """
+    Analyzer(
+        log_level=log_level,
+        log_filepath=log_filepath,
+        # Handle default until the config file can be optional
+        config_filepath=config_filepath or DEFAULT_LIBRETIME_CONFIG_FILEPATH,
+        retry_queue_filepath=retry_queue_filepath,
+    )
+
+
+class Analyzer(AbstractApp):
+    name = "analyzer"
+
+    def __init__(
+        self,
+        *,
+        config_filepath: Optional[Path],
+        retry_queue_filepath: Path,
+        **kwargs,
+    ):
+        super().__init__(**kwargs)
+
+        # Read our rmq config file
+        rmq_config = read_config_file(config_filepath)
+
+        # Start up the StatusReporter process
+        StatusReporter.start_thread(retry_queue_filepath)
+
+        # Start listening for RabbitMQ messages telling us about newly
+        # uploaded files. This blocks until we receive a shutdown signal.
+        self._msg_listener = MessageListener(rmq_config)
+
+        StatusReporter.stop_thread()