`WorkspaceBrowseConfiguration` should support multiple sets of compiler path/args

If I understand correctly, it’s not uncommon for CMake projects to consist of several subprojects that could use different relevant args or hypothetically even different compilers (i.e. target binaries vs. tools built for the host system to be used by the build).

There is also the need for C vs. C++ information, as compiler queries for either may result in different system include paths.

Processing N sets of compiler paths/args here would be similar to what cpptools does with compile_commands.json files - processes all provided compiler paths and (unique and relevant combinations of) args, to build the browse path(s). Cpptools should be able to avoid redundantly querying compilers, so it should not be critical that the configuration provider de-dupe this set.

首先阅读 WorkspaceBrowseConfiguration API，并按照 issue 中的描述，查看 cpptools 如何处理 compile_commands.json。定义并记录对多组编译器路径/参数的支持，包括针对 C 和 C++ 的不同查询；当 API 能够为子项目表示这些集合，而不需要冗余的编译器查询时，即视为完成。