wasm feature flag instead of platform-dependent dependencies

[lovasoa]

Hello !

Currently, this crate fails to compile in wasm, unless the wasm feature flag is provided.

This comes from the fact that wasm-specific dependencies are specified under a feature flag instead of being specified as platform-specific dependencies :

Clarabel.rs/Cargo.toml

Line 58 in 7036899

wasm = ["dep:web-time"]

Using platform-specific dependencies with

[target.'cfg(target_family = "wasm")'.dependencies]
some_wasm_specific_dep = "0.0.0"

would allow the code to compile for wasm without having to specify a feature flag.

This is especially useful to users for whom clarabel is a sub-dependency.

See rust-or/good_lp#63