cores: arduino: Format with clang-format

[soburi]

Use a formatter to standardize indentation.

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Committing to reduce the diff in preparation for the merge.

Please approve #163 and #165 first.

[Copilot]

Pull request overview

This PR primarily applies clang-format style changes across the Arduino Zephyr core to standardize indentation and brace placement, while also pulling in a couple of functional tweaks that go beyond formatting.

Changes:

• Reformat Arduino core sources/headers (Serial, Print, common utilities, entrypoint) for consistent style.
• Update the hello_arduino sample printk format specifiers to use %zu for size_t.
• Modify delay() / delayMicroseconds() in zephyrCommon.cpp (adds always_inline attribute and changes microsecond delay behavior).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
samples/hello_arduino/src/app.cpp	Updates printk size_t format specifiers (%zu).
cores/arduino/zephyrSerial.h	clang-format pass over Serial class declarations/macros.
cores/arduino/zephyrSerial.cpp	clang-format pass; macro formatting and serialEventRun braces.
cores/arduino/zephyrPrint.h	clang-format pass over inline Print methods and helpers.
cores/arduino/zephyrPrint.cpp	clang-format pass over Print support implementation.
cores/arduino/zephyrCommon.cpp	clang-format pass plus behavioral changes to delay functions.
cores/arduino/main.cpp	clang-format pass; adds braces around serialEventRun call.
cores/arduino/apiCommon.cpp	clang-format pass; whitespace/indent changes.
cores/arduino/Arduino.h	clang-format pass over devicetree-related macros/enums.

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