chore: update to cmake 3.10, enforce formatting with tooling

[ptsouchlos]

Changes

• Move to CMake 3.10 as minimum version.
• Add clang-format file
• Add optional build targets for checking and fixing formatting using clang-format
• Added basic CI to build the project and check formatting on pushes and PRs

Closes #130

[Copilot]

Pull Request Overview

This PR modernizes the build system and enforces consistent code formatting by updating to CMake 3.10 and introducing clang-format tooling with automated CI formatting checks.

• Updates minimum CMake version from 3.5 to 3.10
• Adds clang-format configuration file and optional build targets for format checking/fixing
• Implements GitHub Actions CI workflow to build the project and verify formatting

Reviewed Changes

Copilot reviewed 20 out of 22 changed files in this pull request and generated no comments.

File	Description
CMakeLists.txt	Updates minimum CMake version and adds optional clang-format targets
.clang-format	Defines code formatting rules based on LLVM style
.github/workflows/linux.yml	Adds CI workflow for building and format checking
src/.h, src/.cpp	Applies clang-format styling to all source files

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