Implement updated `PyProjectToml`

[cnpryer]

Closes #852 Closes #628 Closes #594

Replaces Metadata with new PyProjectToml backed by toml_edit for LocalMetadata.

Helps with:

• 815

• 833

• 814

• Tool tables and #628

• 824

TODO:

• [x] check out upstream a Table to pyproject-toml
• [x] check out hybrid solution
• [x] implement toml_edit wrapper
• [x] implement .formatted()
• [x] tests
• [x] update scripts init

[cnpryer]

I want to look into upstreaming a toml_edit::Table-backed Tool in the pyproject-toml crate.