Runnables: remove version field from the format (#8118)

This changes the format of runnables slightly (the top-level object is
now a sequence, not a map).
The 2nd commit pulls in aliases from .zshrc and co.
Release Notes:

- N/A

crates/task/src/static_source.rs

@@ -48,10 +48,7 @@ pub(crate) struct Definition {
 
 /// A group of Tasks defined in a JSON file.
 #[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize, JsonSchema)]
-pub struct DefinitionProvider {
-    version: String,
-    tasks: Vec<Definition>,
-}
+pub struct DefinitionProvider(Vec<Definition>);
 
 impl DefinitionProvider {
     /// Generates JSON schema of Tasks JSON definition format.
@@ -121,7 +118,7 @@ impl StaticSource {
                         static_source.tasks = new_definitions
                             .read(cx)
                             .get()
-                            .tasks
+                            .0
                             .clone()
                             .into_iter()
                             .enumerate()