docs: add full tutorial list to WindowsPerf vs extension

[nader-zouaoui]

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This pull request introduces new documentation for the WindowsPerf Visual Studio extension, detailing its various features and how to use them. The most important changes include the addition of new markdown files that cover the setup and usage of the extension's counting, sampling, and SPE features, as well as guidance for next steps.

Documentation Additions:

• content/learning-paths/laptops-and-desktops/windowsperf-vs-extension/_index.md: Added an overview of the WindowsPerf Visual Studio extension, including prerequisites and learning objectives.
• content/learning-paths/laptops-and-desktops/windowsperf-vs-extension/counting-feature.md: Added a detailed guide on using the Counting feature, including setup, configuration, and result analysis.
• content/learning-paths/laptops-and-desktops/windowsperf-vs-extension/sampling-feature.md: Added a detailed guide on using the Sampling feature, including setup, configuration, and result analysis.
• content/learning-paths/laptops-and-desktops/windowsperf-vs-extension/spe-feature.md: Added a guide on the SPE feature, detailing its prerequisites and differences from the Sampling feature.

Guidance for Next Steps:

• content/learning-paths/laptops-and-desktops/windowsperf-vs-extension/_next-steps.md: Added guidance for next steps after using the WindowsPerf Visual Studio extension, including further reading and recommended paths.

closes arm-developer-tools/windowsperf-vs-extension#11