[VaggelisD]

Fixes #1254

The default behavior of plan diff is to compare raw models i.e the original queries & statements:

Differences from the `dev` environment:

Models:
└── Directly Modified:
    └── default__dev.test

--- 

+++ 

@@ -4,13 +4,13 @@

 CREATE TABLE IF NOT EXISTS foo AS
 (
   SELECT
-    @OR(FALSE, TRUE)
+    @AND(TRUE, NULL)
 )
 SELECT
-  4 + 2
+  5 + 2
 CREATE TABLE IF NOT EXISTS foo2 AS
 (
   SELECT
-    @AND(TRUE, FALSE)
+    @OR(TRUE, NULL)
 )
-DROP VIEW @this_model
+DROP VIEW IF EXISTS @this_model

This PR introduces the sqlmesh plan --rendered-model-diff which instead compares rendered queries/statements:

@@ -4,13 +4,13 @@

 CREATE TABLE IF NOT EXISTS "foo" AS
 (
   SELECT
-    FALSE OR TRUE
+    TRUE
 )
 SELECT
-  6 AS "_col_0"
+  7 AS "_col_0"
 CREATE TABLE IF NOT EXISTS "foo2" AS
 (
   SELECT
-    TRUE AND FALSE
+    TRUE
 )
-DROP VIEW "test"
+DROP VIEW IF EXISTS "test"