Replace requirements.txt with pyproject.toml for dependency management

[amandakys]

Introduction

Tracking ticket for discussion about

"Moreover, we should move away from using setup.py and make all Kedro starters use only pyproject.toml and setup.cfg, since this is how the Python ecosystem is evolving."

and

"The setup.cfg, src/setup.py and src/requirements.txt should be replaced with pyproject.toml. pip/setuptools support pyproject.toml out of the box. Would love to have this by default in new projects."

These are comments that came up in #2149 and should be discussed separately to the planned work to strip the project template #2756

[astrojuanlu]

This is blocked on #2519.