fix: update pyproject.toml and requirements.txt with required fields

[mwbrooks]

Type of change

• New feature
• Bug fix
• Documentation

Summary

This pull request updated pyproject.toml and requirements.txt with the following:

• Fixes pip install -e . error by adding the required [tool.setuptools.packages.find] fields to pyproject.toml
• Updates pyproject.toml with the name, version, and minimum Python version fields
• Updates pyproject.toml with the dependencies for developers who prefer to use pyproject.toml instead of requirementst.txt
• Add slack-cli-hooks<1.0.0 to both requirements.txt and pyproject.toml because we're starting to include this dependency in sample apps

Test Steps

# Setup Virtual Environment
$ python3 -m venv .venv
$ source .venv/bin/activate

$ pip install -e .
# → Confirm no errors

$ pip install -r requirements.txt
# → Confirm no errors

Requirements

• I have ensured the changes I am contributing align with existing patterns and have tested and linted my code
• I've read and agree to the Code of Conduct

[zimeg]

@mwbrooks Amazing improvements to project health! Let's continue to prefer the latest standards in samples 💌 🐍

[zimeg]

🪓 question: Should we prefer pyproject.toml overall? IIRC requirements.txt isn't recommended going forward but no blocker here!

[mwbrooks]

Yea, I think so. In future iterations, let's start only including pyproject.toml.

[zimeg]

👁️‍🗨️ praise: This might be difficult to maintain onward but perhaps we revisit sample structure later?

[mwbrooks]

Yea, I wonder if we should start to store everything in src/?

[zimeg]

🔭 question: I'm alright keeping this as a required dependency, but would we want to move this to optional? I'm also still a believer in pinned version FWIW-

[mwbrooks]

Sure, let's move it to optional in the future

[srtaalej]

optional and pinned >> 👀

[mwbrooks]

Thanks for the review and great ideas! Let's incorporate these in the future iterations of the Sample Apps!