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/linux/datetime-init.c

@@ -23,7 +23,7 @@ static int32_t Time_Offset; /* Time offset in ms */
 /**
  * @brief Calculate the time offset from the system clock.
  * @return Time offset in ms
-  */
+ */
 static int32_t time_difference(struct timeval t0, struct timeval t1)
 {
     return (t0.tv_sec - t1.tv_sec) * 1000 + (t0.tv_usec - t1.tv_usec) / 1000;