feat(formatter): update prettier-plugin-solidity to 2 and enable the slang parser

Author: Yurii721

.prettierrc.json

@@ -4,7 +4,7 @@
         {
             "files": "*.sol",
             "options": {
-                "parser": "solidity-parse",
+                "parser": "slang",
                 "printWidth": 120,
                 "tabWidth": 4,
                 "useTabs": false,

package.json

@@ -88,7 +88,7 @@
         "lint-staged": "15.5.1",
         "mocha": "11.1.0",
         "prettier": "3.5.3",
-        "prettier-plugin-solidity": "1.4.3",
+        "prettier-plugin-solidity": "2.0.0",
         "solhint": "5.0.5",
         "solidity-coverage": "0.8.15",
         "solidity-docgen": "0.6.0-beta.36",