feat: implement template plan

examples/plan/forest.kdl

@@ -1,3 +1,13 @@
 plan {
 	name project
+	
+	templates type=jinja2 {
+		path "templates/*.jinja2"
+		output "output/"
+	}
+
+	scripts {
+		world type=shell {}
+		hello type=shell {}
+	}
 }

examples/plan/scripts/hello.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env zsh
+
+set -e
+
+echo "hello plan"

examples/plan/scripts/world.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env zsh
+
+set -e
+
+echo "hello plan world"

examples/plan/templates/something.plan.yaml.jinja2

@@ -0,0 +1,3 @@
+something plan
+
+val is mapping: {{ global.someKey.some.key.val is mapping  }}

examples/plan/templates/something.yaml.jinja2

@@ -0,0 +1,3 @@
+something plan
+
+val is mapping: {{ global.someKey.some.key.val is mapping  }}