Start splitting up parsing

src/parser/commands.rs

@@ -0,0 +1,7 @@
+use crate::commands::Command;
+
+use super::{ParseResult, Parser};
+
+pub fn parse(p: &mut Parser<'_>) -> ParseResult<Vec<Command>> {
+    todo!()
+}

src/parser/task.rs

@@ -0,0 +1,7 @@
+use crate::commands::Task;
+
+use super::{ParseResult, Parser};
+
+fn parse_task(p: &mut Parser<'_>) -> ParseResult<Task> {
+    todo!()
+}