sphinx documentation; adjusted all docstrings; moved some modules to non-public subpackage

src/asyncio_taskpool/internals/constants.py

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+__author__ = "Daniil Fajnberg"
+__copyright__ = "Copyright © 2022 Daniil Fajnberg"
+__license__ = """GNU LGPLv3.0
+
+This file is part of asyncio-taskpool.
+
+asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
+version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
+
+asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+See the GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
+If not, see <https://www.gnu.org/licenses/>."""
+
+__doc__ = """
+Constants used by more than one module in the package.
+
+This module should **not** be considered part of the public API.
+"""
+
+
+PACKAGE_NAME = 'asyncio_taskpool'
+
+DEFAULT_TASK_GROUP = 'default'
+
+DATETIME_FORMAT = '%Y-%m-%d_%H-%M-%S'
+
+SESSION_MSG_BYTES = 1024 * 100
+
+STREAM_WRITER = 'stream_writer'
+CMD = 'command'
+CMD_OK = b"ok"
+
+
+class CLIENT_INFO:
+    __slots__ = ()
+    TERMINAL_WIDTH = 'terminal_width'