Replace deprecated pkg_resources with importlib.metadata

- Now uses importlib.metadata.version in devchat/_cli.py.
- Removed setuptools from the dependencies in pyproject.toml.
- Added importlib-metadata to the dependencies in pyproject.toml.
- Updated the poetry.lock file to reflect the changes in dependencies.

devchat/_cli.py

@@ -6,7 +6,7 @@
 import os
 import sys
 from typing import List, Optional, Tuple
-import pkg_resources
+import importlib.metadata
 import rich_click as click
 from devchat.store import Store
 from devchat.openai import OpenAIChatConfig, OpenAIChat
@@ -19,7 +19,7 @@
 
 
 @click.group()
-@click.version_option(pkg_resources.get_distribution("devchat").version, '--version',
+@click.version_option(importlib.metadata.version("devchat"), '--version',
                       message='DevChat %(version)s')
 def main():
     """DevChat CLI: A command-line interface for DevChat."""

pyproject.toml

@@ -26,7 +26,7 @@ rich_click = "^1.6.1"
 tiktoken = "^0.4.0"
 tinydb = "^4.7.1"
 urllib3 = "<2.0"
-setuptools = "^68.0.0"
+importlib-metadata = "^6.8.0"
 
 [tool.poetry.scripts]
 devchat = "devchat._cli:main"