`TryFrom<&Path>` should not be used

[tdelabro]

blockifier/crates/blockifier/src/versioned_constants.rs

Lines 207 to 214 in 0899890

	impl TryFrom<&Path> for VersionedConstants {
	type Error = VersionedConstantsError;
	fn try_from(path: &Path) -> Result<Self, Self::Error> {
	Ok(serde_json::from_reader(std::fs::File::open(path)?)?)
	}
	}

https://doc.rust-lang.org/std/convert/trait.TryFrom.html

TryFrom is for type conversion. The implementation here reads from disk and does json parsing, we are way beyond type conversion. Nothing from the resulting type can be found in the original one. By this logic, any function that takes one single argument and returns another single different type could be implemented as From/TryFrom.

Now, what if I also want to offer a way to create the type from a toml file? I can only have a single implem of TryFrom<&Path> for VersionedConstants, so I have to add it to the existing one? How do I know if I should expect a toml or a json. This is obviously a bad design.
The correct way here is to add a from_json_file method to the impl VersionedConstant block.