Support SPL processor in ilogtail for enhanced data processing

[linrunqi08]

需要重点关注的文件：

core/reader/SourceBuffer.h 这里把原内存池实现替换了一下，主要参考的是spl的内存池实现
core/aggregator/Aggregator.cpp 这里把原来Add函数修改了一下，SPL会使用LOGSOTE模式进行聚合，聚合就是使用list的形式进行发送。
core/processor/daemon/LogProcess.cpp 这里PipelineEventGroup转logGroup的时候，之前接口参数改成list的时候有遗漏，现在补充上了

This commit introduces support for the SLS Processing Language (SPL) within the ilogtail observability collector, allowing users to leverage SPL for data processing and explorative querying. SPL, a proprietary data processing language developed by Alibaba Cloud for its Log Service (SLS), adopts a shell-like pipeline symbol (|) approach that facilitates sequential data processing and analysis.

With the integration of the SPL Processor, ilogtail users can now apply SPL's powerful data transformation and querying capabilities directly within the observability collector. This feature enhances the flexibility and efficiency of data handling in observability scenarios, offering a familiar and intuitive syntax for users already accustomed to shell operations.

However, it is important to note that the current implementation imposes a limitation where the SPL Processor cannot be configured in conjunction with other C++ processors. This restriction is in place to ensure compatibility and stability of the processing pipeline within ilogtail.

For additional information on SPL and its functionalities, please refer to the official documentation: https://help.aliyun.com/zh/sls/user-guide/spl-overview.

This SPL support marks a significant step forward in expanding ilogtail’s processing capabilities and in providing users with more versatile tools for data analysis within the Alibaba Cloud ecosystem.

[nelsontang]

编译错误：fatal error: spl/rw/IO.h: No such file or directory
请问是否有依赖库地址？