[WIP] feat Pipeline Cache

[futz12]

new funaction:

    int load_pipeline_cache(const std::vector<unsigned char>& buf) const;
    int save_pipeline_cache(std::vector<unsigned char>& buf) const;
#ifdef NCNN_STDIO
    int load_pipeline_cache(FILE* fp) const;
    int load_pipeline_cache(const char* filename) const;
    int save_pipeline_cache(FILE* fp) const;
    int save_pipeline_cache(const char* filename) const;
#endif

使用 PipelineCache 加速 Pipeline 创建过程
测试环境
CPU: i9 13900HX
GPU: 4060Laptop
驱动版本: 576.80

以 MobileNetv3 为例，热启动（在驱动有缓存的情况下）：

test_gpu_pipecache passed, time = 590.000 ms
test_gpu_pipecache passedtest_gpu_pipecache passed after loading pipeline cache, time = 449.000 ms

Resnet50 冷启动

test_gpu_pipecache passed, time = 2725.000 ms
test_gpu_pipecache passedtest_gpu_pipecache passed after loading pipeline cache, time = 609.000 ms

聊胜于无

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[github-actions]

The binary size change of libncnn.so (bytes)

architecture	base size	pr size	difference
x86_64	15602512	15611816	+9304 ⚠️
armhf	6611348	6616728	+5380 ⚠️
aarch64	9921904	9922440	+536 ⚠️

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.08434% with 24 lines in your changes missing coverage. Please review.

Project coverage is 95.82%. Comparing base (7557f5c) to head (eeefe33).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/gpu.cpp	71.08%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6150      +/-   ##
==========================================
+ Coverage   95.81%   95.82%   +0.01%     
==========================================
  Files         831      831              
  Lines      264948   265030      +82     
==========================================
+ Hits       253851   253963     +112     
+ Misses      11097    11067      -30     

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[futz12]

#6221