feat: AST comparison API (#689)

Author: jubnzv

Diff for: .gitignore

@@ -8,4 +8,4 @@ output/
 src/grammar/grammar.ohm-bundle.js
 src/grammar/grammar.ohm-bundle.d.ts
 src/func/funcfiftlib.wasm.js
-
+src/test/contracts/pretty-printer-output

Diff for: CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Initial version of the API providing AST equivalence check: PR [#689](https://github.com/tact-lang/tact/pull/689)
+
 ### Changed
 
 ### Fixed

Diff for: cspell.json

@@ -81,6 +81,9 @@
     "привет",
     "PUSHREF",
     "PUSHSLICE",
+    "renamer",
+    "Brujin",
+    "dentry",
     "SETINDEXVARQ",
     "gettest"
   ],