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>

ports/arduino_uno/txbuf.h

@@ -1,10 +1,10 @@
 /**************************************************************************
-*
-* Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
-*
-* SPDX-License-Identifier: MIT
-*
-*********************************************************************/
+ *
+ * Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ *********************************************************************/
 #ifndef TXBUF_H
 #define TXBUF_H