Extract deserialize_yml to axoasset

[mistydemeo]

We have a function in cargo-dist that's essentially a copy of axoasset's deserialize_toml and deserialize_json, but for YAML:

cargo-dist/cargo-dist/src/backend/ci/github.rs

Lines 876 to 893 in 81ca476

	/// Try to deserialize the contents of the SourceFile as yaml
	///
	/// FIXME: upstream to axoasset
	fn deserialize_yaml<'a, T: for<'de> serde::Deserialize<'de>>(
	src: &'a SourceFile,
	) -> Result<T, crate::errors::AxoassetYamlError> {
	let yaml = serde_yml::from_str(src.contents()).map_err(|details| {
	let span = details
	.location()
	.and_then(|location| src.span_for_line_col(location.line(), location.column()));
	crate::errors::AxoassetYamlError {
	source: src.clone(),
	span,
	details,
	}
	})?;
	Ok(yaml)
	}

It would be great for us to extract it from cargo-dist and get it into axoasset.

[duckinator]

The first half of this (adding the implementation to axoasset) is here: axodotdev/axoasset#235

[duckinator]

The second half is #1604.