Send OpenFile request with kind field

[lionel-]

Companion PR for posit-dev/positron#8816

QA Notes

See linked PR.

[DavisVaughan]

I feel like the argument names are a little mixed up, I feel like if we are generalizing, it should become

// The path of the file or URI to open
pub path: String

// How to interpret the `path` argument: as a file or a URI.
// If omitted, defaults to `File`
pub kind: OpenEditorPathKind

#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, strum_macros::Display, strum_macros::EnumString)]
pub enum OpenEditorPathKind {
	#[serde(rename = "file")]
	#[strum(to_string = "file")]
	File,

	#[serde(rename = "uri")]
	#[strum(to_string = "uri")]
	Uri
}

i.e. to me the ambiguous concept is a path, which is specialized to either a file or a uri.

[DavisVaughan]

The positron side of this PR seems to agree with me, where you have

				if (ed.kind === 'uri') {
					file = URI.parse(ed.file);
				} else {
					file = URI.file(ed.file);
				}

i.e. you have an arbitrary path, if URI you parse() it, otherwise if File you file() it

[lionel-]

That makes sense

[lionel-]

Although I think I'd prefer not to change path as this would likely require updating the Python side. The current setup is backward compatible.