Run clang-format and enable CI check for it (#755)

* pre-commit: Update and enable clang-format check

There is newer version from clang-format so use that. We do not yet want
18 as that is little bit too new.

* Format some thing by hand which clang-format "breaks"

Clang-format will format some things little bit off in some cases.
Format some things by hand so we get cleaner end result.

* Run clang-format with

```
pre-commit run --all-files clang-format
```

We have already in previously checked places where clang-format does not
make good format and ignored those (hopefully most of the things).

---------

Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>

test/bacnet/basic/sys/keylist/src/main.c

@@ -291,8 +291,9 @@ static void testKeyListLarge(void)
     const unsigned num_keys = 1024 * 16;
 
     list = Keylist_Create();
-    if (!list)
+    if (!list) {
         return;
+    }
 
     for (key = 0; key < num_keys; key++) {
         data_list[key] = 42 + key;