ci: compliance: add clang format workflow and align source files to it

[nmpluta]

Refs: #3

[Copilot]

Pull Request Overview

This PR adds a clang-format compliance workflow to ensure consistent C/C++ code formatting across the project and reformats existing source files to align with the new formatting standards.

• Adds a GitHub Actions workflow that automatically checks clang-format compliance on pull requests
• Introduces a comprehensive .clang-format configuration file with project-specific rules
• Reformats existing C source and header files to comply with the new formatting standards

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/clang-format.yml	GitHub Actions workflow for automated clang-format checking
.clang-format	Comprehensive clang-format configuration with project-specific macros and style rules
tests/lib/custom/src/main.c	Reformatted test assertions to fit within line length limits
include/app/drivers/blink.h	Reformatted function declarations to single lines
drivers/sensor/example_sensor/example_sensor.c	Reformatted function signatures and macro definitions
drivers/blink/gpio_led.c	Reformatted function calls and macro definitions
app/src/main.c	Reformatted printk statement and removed trailing newline

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}