Convert scripts to entry_points

This MR converts all of the scripts previously managed in bin/ into entry points constructed from code now managed as modules in the new dqsegdb.tools subpackage.

Using entry points rather than scripts has a few advantages

• much easier to test functions in the code independently of the whole
• much easier to measure coverage
• entry points are more portable (easier to install on non-Unix platforms, for example)
• allows for a noarch: python conda package (niche benefit)

This should have no impact on the functionality or usability of any of the current scripts.

dqsegdb/tests/test_entry_points.py

+# -*- coding: utf-8 -*-
+# Copyright (C) Cardiff University (2023)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Tests for entry points defined in :mod:`dqsegdb.tools`.
+"""
+
+import pytest
+
+try:
+    import importlib.metadata as importlib_metadata
+except ModuleNotFoundError:  # python < 3.8
+    importlib_metadata = pytest.importorskip("importlib_metadata")
+
+from .. import (__version__, __name__)
+
+__author__ = 'Duncan Macleod <duncan.macleod@ligo.org>'
+
+# discover all of the registered console_scripts for this project
+try:
+    ENTRY_POINTS = importlib_metadata.distribution(__name__).entry_points
+except importlib_metadata.PackageNotFoundError:  # package not built/installed
+    ENTRY_POINTS = []
+SCRIPTS = [ep for ep in ENTRY_POINTS if ep.group == "console_scripts"]
+PARAMETRIZE_SCRIPTS = pytest.mark.parametrize(
+    "script",
+    [pytest.param(ep, id=ep.name) for ep in SCRIPTS],
+)
+
+
+def _run_entry_point(script, args):
+    """Run an entry point.
+    """
+    main = script.load()
+    with pytest.raises(SystemExit):
+        main(args)
+
+
+@PARAMETRIZE_SCRIPTS
+def test_help(script):
+    """Test that --help works for each console script.
+    """
+    return _run_entry_point(script, ['--help'])