Enable pdbpp configuration using pyproject.toml file

[deepaerial]

pyptoject.toml is solid standard in Python's ecosystem and majority of tools like poetry, pytest etc. allow storing all required configurations or metadata in this file. I think it would be great if pdbpp supported this standard as well so it would be possible to keep everything regarding dev environment in one place. I would expect the config section look something like this:

[tool.pdbpp]
sticky_by_default = true
editor = "nvim"