Generate timestamps if available

[bugadani]

This PR implements optional timestamp support by adding a function to Dependencies (to query whether a timer is available) and one function to Swd and Jtag each to get the current timestamp.

[Copilot]

Pull request overview

This PR implements optional timestamp support for CMSIS-DAP by adding infrastructure to query timer availability and retrieve timestamps. The implementation adds new trait methods with default implementations to maintain backward compatibility.

Changes:

• Added timer_available() to the Dependencies trait to query timer support
• Added timestamp() methods to both Swd and Jtag traits to retrieve current timestamps
• Integrated timestamp functionality into DAP transfer operations, replacing TODO placeholders
• Updated capability flags to advertise timer support when available

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/swj.rs	Added timer_available() method to Dependencies trait with default false return
src/swd.rs	Added timestamp() method to Swd trait with default zero return
src/jtag.rs	Added timestamp() method to Jtag trait with default zero return
src/mock_device.rs	Added timer_available forwarding to mock device implementation
src/dap.rs	Integrated timestamp calls into SWD and JTAG transfer operations, enabled TEST_DOMAIN_TIMER capability flag

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