Add settings.viaIR to standard json

docs/using-the-compiler.rst

@@ -252,6 +252,9 @@ Input Description
         // Affects type checking and code generation. Can be homestead,
         // tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg, istanbul or berlin
         "evmVersion": "byzantium",
+        // Optional: Change compilation pipeline to go through the Yul intermediate representation.
+        // This is a highly EXPERIMENTAL feature, not to be used for production. This is false by default.
+        "viaIR": true,
         // Optional: Debugging settings
         "debug": {
           // How to treat revert (and require) reason strings. Settings are