Globally upgrade to syn 2.x and latest quote and proc_macro2 1x versions (#13846)

* globally upgrade quote to latest 1.0.x (1.0.26)

* globally upgrade syn to final 1.0.x version (1.0.109)

* globally upgrade proc-macro2 to 1.0.56

* upgrade to syn v2.0.13 and fix everything except NestedMeta

* fix parse nested metadata code in decl_runtime_apis.rs

* Port more stuff to syn 2.0

* Make the rest compile

* Ignore error

* update to syn 2.0.14

---------

Co-authored-by: Bastian Köcher <info@kchr.de>

substrate/frame/support/test/tests/pallet_ui/pallet_doc_arg_non_path.stderr

@@ -1,4 +1,4 @@
-error: The `pallet_doc` received an unsupported argument. Supported format: `pallet_doc(PATH)`
+error: The `pallet_doc` received an unsupported argument. Supported format: `pallet_doc("PATH")`
  --> tests/pallet_ui/pallet_doc_arg_non_path.rs:3:1
   |
 3 | #[pallet_doc(X)]

substrate/frame/support/test/tests/pallet_ui/pallet_doc_empty.stderr

@@ -1,4 +1,4 @@
-error: The `pallet_doc` attribute must receive arguments as a list. Supported format: `pallet_doc(PATH)`
+error: The `pallet_doc` received an unsupported argument. Supported format: `pallet_doc("PATH")`
  --> tests/pallet_ui/pallet_doc_empty.rs:3:1
   |
 3 | #[pallet_doc]

substrate/frame/support/test/tests/pallet_ui/pallet_doc_invalid_arg.stderr

@@ -1,4 +1,4 @@
-error: The `pallet_doc` attribute must receive arguments as a list. Supported format: `pallet_doc(PATH)`
+error: The `pallet_doc` received an unsupported argument. Supported format: `pallet_doc("PATH")`
  --> tests/pallet_ui/pallet_doc_invalid_arg.rs:3:1
   |
 3 | #[pallet_doc = "invalid"]

substrate/frame/support/test/tests/pallet_ui/pallet_doc_multiple_args.stderr

@@ -1,4 +1,4 @@
-error: The `pallet_doc` attribute must receive only one argument. Supported format: `pallet_doc(PATH)`
+error: The `pallet_doc` received an unsupported argument. Supported format: `pallet_doc("PATH")`
  --> tests/pallet_ui/pallet_doc_multiple_args.rs:3:1
   |
 3 | #[pallet_doc("A", "B")]

substrate/frame/support/test/tests/pallet_ui/storage_result_query_parenthesized_generics.stderr

@@ -1,5 +1,5 @@
-error: Invalid pallet::storage, unexpected generic args for ResultQuery, expected angle-bracketed arguments, found `(NonExistentValue)`
+error: expected `,`
   --> tests/pallet_ui/storage_result_query_parenthesized_generics.rs:18:55
    |
 18 |     type Foo<T: Config> = StorageValue<_, u8, ResultQuery(NonExistentValue)>;
-   |                                                          ^^^^^^^^^^^^^^^^^^
+   |                                                          ^