rust: time: Replace HrTimerMode enum with trait-based mode types

Replace the `HrTimerMode` enum with a trait-based approach that uses
zero-sized types to represent each mode of operation. Each mode now
implements the `HrTimerMode` trait.

This refactoring is a preparation for replacing raw `Ktime` in HrTimer
with the `Instant` and `Delta` types, and for making `HrTimer` generic
over a `ClockSource`.

Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Link: https://lore.kernel.org/r/20250610132823.3457263-3-fujita.tomonori@gmail.com
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>

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