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/metadata_analyzer.py

@@ -1,12 +1,11 @@
 import datetime
 import hashlib
-import logging
 import os
-import time
 import wave
 
 import magic
 import mutagen
+from loguru import logger
 
 from .analyzer import Analyzer
 
@@ -190,6 +189,6 @@ class MetadataAnalyzer(Analyzer):
             metadata["length_seconds"] = length_seconds
             metadata["cueout"] = metadata["length"]
         except wave.Error as ex:
-            logging.error("Invalid WAVE file: {}".format(str(ex)))
+            logger.error("Invalid WAVE file: {}".format(str(ex)))
             raise
         return metadata