Add Package Features

[schang412]

Point to cetz v0.0.1 and use update necessary functions.
Add typst.toml for packaging.

[flavio20002]

Hi, two things:

• Add automatic tests #3 was built on top of this merge request.
• I don't like very much

import "@local/circuitypst:0.0.1": node, to

in the examples folder, because is not convenient for development (one should install the package locally every time). It's way more better to replace it with

import "../circuitypst.typ": node, to

and launch the compilation with

typst --root "." watch .\examples\current-shunt.typ

[Gobot1234]

Should this also not use cetz:0.1.1 as the package version?