refactor: Extract add_leaf to its own ops function

[lsetiawan]

Need to extract the following add_leaf method to its own ops function and then call it here so it can be used independently of TreeVec

phylo2vec/phylo2vec/src/tree_vec/mod.rs

Lines 84 to 109 in fb06aca

	pub fn add_leaf(&mut self, leaf: usize, branch: usize) {
	self.data.push(branch);
	let mut ancestry_add = self.get_ancestry();
	println!("{:?}", ancestry_add);
	let mut found_first_leaf = false;
	for r in 0..ancestry_add.len() {
	for c in 0..3 {
	if !found_first_leaf && ancestry_add[r][c] == self.data.len() {
	// Find the indices of the first leaf
	// and then set the value to the new leaf
	ancestry_add[r][c] = leaf;
	found_first_leaf = true;
	} else if ancestry_add[r][c] >= leaf {
	ancestry_add[r][c] += 1;
	}
	}
	}
	// ancestry_add[leaf_coords][leaf_col] = leaf as isize;
	// let ancestry_add_ref = &mut ancestry_add;
	ops::order_cherries(&mut ancestry_add);
	ops::order_cherries_no_parents(&mut ancestry_add);
	self.data = ops::build_vector(ancestry_add);
	}