Add swift6 generator (#19621)

* [Swift6] create Swift6 generator

* [Swift6] create Swift6 generator

* Update vapor integration

* Update bitrise stack to Xcode 16

* [Swift6] tryped throws

* [Swift6] tryped throws

* [Swift6] combine deferred and api static method

* [Swift6] update readme

* [Swift6] fix some errors

* [Swift6] fix some errors

* [Swift6] fix some errors

* [Swift6] update docs

* [Swift6] update docs

* Use multiline comments for examples in csharp generator (#19079)

* multi

* gen

* Uncomment File::deleteOnExit (#19624)

* [Core/Rust Server] Check references in additionalProperties correctly when checking freeForm status (#19605)

* Check references in additionalProperties correctly

Handle references in additionalProperties correctly when determining free-form status

* Update samples

* [Rust Server] Handle arrays in forms (#19625)

* [Rust Server] Handle arrays in forms correctly

* [Rust Server] Add tests

* Update samples

* [Swift6] fix CI

* [Swift6] fix CI

* [Swift6] fix CI

* [Swift6] fix CI

---------

Co-authored-by: Liri S <reallyliri@gmail.com>
Co-authored-by: Beppe Catanese <1771700+gcatanese@users.noreply.github.com>
Co-authored-by: Richard Whitehouse <git@richardwhiuk.com>
Co-authored-by: William Cheng <wing328hk@gmail.com>

samples/client/petstore/swift6/asyncAwaitLibrary/Package.resolved

@@ -0,0 +1,15 @@
+{
+  "originHash" : "d5919dc82f97fd3c9a6e6c48a59960902c9b17904f5461a66b7bc540833bfea1",
+  "pins" : [
+    {
+      "identity" : "anycodable",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/Flight-School/AnyCodable",
+      "state" : {
+        "revision" : "862808b2070cd908cb04f9aafe7de83d35f81b05",
+        "version" : "0.6.7"
+      }
+    }
+  ],
+  "version" : 3
+}