增加个全局 delta时间 ，添加BITOPS

[htl5241]

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代码质量 Code Quality：

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• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 代码是高质量的 Code in this PR is of high quality
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[Copilot]

Pull Request Overview

Adds a helper to calculate elapsed ticks across wrap-around and introduces generic bit-operation macros.

• Implements and exports rt_delta_tick_get() for delta-tick calculation.
• Declares the new API in rtthread.h.
• Adds BITOPS macros in rtdef.h for common bit manipulations.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/clock.c	New rt_delta_tick_get() implementation and export
include/rtthread.h	Declaration of rt_delta_tick_get() API
include/rtdef.h	Addition of BITOPS macros (BIT, BIT_MASK, GENMASK, etc.)