chore: bump savvy from 0.2.18 to 0.3.0 in /src/rust

[dependabot]

Bumps savvy from 0.2.18 to 0.3.0.

Changelog

Sourced from savvy's changelog.

[v0.3.0] (2024-03-24)

New Features

• Now user-defined struct can be used as an argument of #[savvy]-ed functions. It must be specified as &Ty or &mut Ty, not Ty.

Example:

struct Person {
    pub name: String,
}
#[savvy]
impl Person {
fn get_name(&self) -> savvy::Result<savvy::Sexp> {
let name = self.name.as_str();
name.try_into()
}
}
#[savvy]
fn get_name_external(x: &Person) -> savvy::Result<savvy::Sexp> {
x.get_name()
}

Fixed bugs

• Previously, savvy-cli init and savvy-cli update didn't handle the package name properly ("packageName" vs "package_name"). Now it's fixed.

Breaking changes

• While this is described in the New Features section, it was already allowed to specify user-defined structs as argument if the user defines the necessary TryFrom implementations propoerly. At that time, specifying it without & was possible, but now it's not allowed. Anyway, as this was undocumented and expert-only usage, I expect no one notices this breaking change.

[v0.2.20] (2024-03-23)

[v0.2.19] (2024-03-23)

New Features

• LogicalSexp and OwnedLogicalSexp now have as_slice_raw() method. This is an expert-only function which might be found useful when you really need to distinguish NAs.

... (truncated)

Commits

• 36e18d4 Avoid depending on savvy
• e361515 chore: Release
• f37f44d Update book
• 5674233 Add some tests about alternative constructor
• ca1e64e Tweak R function generation
• ae01728 Merge branch 'main' of https://github.com/yutannihilation/savvy
• fb270e2 Update book
• 53c24ef Fix wrong use of snake_case_name (#115)
• 4b36f90 Allow EXTPTRSXP as argument (#114)
• bc4b250 Update the book
• Additional commits viewable in compare view

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