libraries: Format with clang-format

[soburi]

Use a formatter to standardize indentation.

[Copilot]

Pull request overview

This PR standardizes formatting in the Arduino compatibility Wire (I2C) and SPI libraries by applying clang-format, improving consistency with the repository’s .clang-format settings.

Changes:

• Re-indented and reformatted Wire and SPI headers/implementations (tabs, spacing, line wrapping).
• Expanded some previously single-line empty/short function bodies into multi-line brace blocks.
• Adjusted formatting/alignment for a few macros and declarations.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
libraries/Wire/Wire.h	clang-format applied to class declarations, pointer spacing, and struct formatting
libraries/Wire/Wire.cpp	clang-format applied to method definitions, indentation, and wrapping
libraries/SPI/SPI.h	clang-format applied to indentation and macro alignment/wrapping
libraries/SPI/SPI.cpp	clang-format applied to indentation and wrapping of SPI operations and helpers

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