Feature/cpu 64core support

[Hansersdog]

概述

本次提交对 ncnn 项目中的 CpuSet 类进行了重要改进，主要针对Windows平台增加了对64核以上CPU的多处理器组（Processor Groups）支持，解决了在高核心数系统上的CPU识别，管理问题。LInux & android平台原生支持最大1024核，未改变。MacOs的也未进行改动。

设计思路

把原来的64位ULONG_PTR掩码设计成组，分组进行管理，每组内仍使用ULONG_PTR作为掩码

新增功能：

• MAX_CPU_GROUPS ：定义最大支持的处理器组数量（20个）
• masks[MAX_CPU_GROUPS] ：用于存储每个处理器组的CPU掩码
• max_cpus 和 active_groups ：记录最大CPU数量和活跃组数
• get_max_cpus() ：获取最大CPU数量
  本代码未使用，但认为可能会在其他模块需要这样的api
• get_group_mask(int group) ：获取指定组的CPU掩码
• get_active_group_count() ：获取活跃处理器组数量

[tencent-adm]

All committers have signed the CLA.

[github-actions]

The binary size change of libncnn.so (bytes)

architecture	base size	pr size	difference
x86_64	15643128	15657392	+14264 ⚠️
armhf	6648220	6653768	+5548 ⚠️
aarch64	9986896	9989696	+2800 ⚠️

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.98%. Comparing base (075d07e) to head (41a1c17).
Report is 22 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6190      +/-   ##
==========================================
+ Coverage   95.82%   95.98%   +0.15%     
==========================================
  Files         834      835       +1     
  Lines      265366   265247     -119     
==========================================
+ Hits       254280   254586     +306     
+ Misses      11086    10661     -425     

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[nihui]

remove unrelated changes (build.sh and build-android.cmd)