Add if else if chains

Signed-off-by: Marcel Müller <neikos@neikos.email>

tests/cases/2-ast@condition.snap

@@ -7,16 +7,16 @@ TemplateAst {
     root: [
         ConditionalChain {
             chain: [
-                IfConditional {
-                    if_block: Block {
-                        prev_whitespace_content: None,
+                Block {
+                    prev_whitespace_content: None,
+                    expression: IfConditional {
                         expression: VariableAccess(
                             [Ident]"test" (6..10),
                         ),
-                        post_whitespace_content: Some(
-                            [Whitespace]"\n    " (13..18),
-                        ),
                     },
+                    post_whitespace_content: Some(
+                        [Whitespace]"\n    " (13..18),
+                    ),
                 },
                 ConditionalContent {
                     content: [

tests/cases/3-instructions@condition.snap

@@ -14,7 +14,7 @@ input_file: tests/cases/condition.nomo
         emit_slot: VariableSlot {
             index: 0,
         },
-        jump: 3,
+        jump: 9223372036854775807,
     },
     AppendContent {
         content: "\n    " (13..18),
@@ -22,6 +22,12 @@ input_file: tests/cases/condition.nomo
     AppendContent {
         content: "Hello World!" (18..30),
     },
+    Jump {
+        jump: 3,
+    },
+    AppendContent {
+        content: "\n    " (13..18),
+    },
     AppendContent {
         content: "\n" (30..31),
     },

tests/cases/4-output@condition.snap

@@ -3,4 +3,4 @@ source: tests/file_tests.rs
 expression: output
 input_file: tests/cases/condition.nomo
 ---
-"\n    Hello World!\n\n\nmore"
+"\n    Hello World!\n\nmore"