Wrap various bluetooth service API with extern "C"

[semlanik]

Make service API usable in C++ code without the need of explicit include statements wrapping.

Description

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Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[CLAassistant]

All committers have signed the CLA.

[rahult-github]

Ok . Thanks for the change. Will integrate