lint(co): detect libstdc++ generator

perf(io_context): revert submission_threshold

feat(lazy_io): detach io requires r-value

lint(io_context): explicit unsigned immediate

build(all): extern liburingcxx; use configure, no `-D`

feat(uring): update io_uring.h to 2023/12/30

build(cmake): link sanitizer if enabled

lint(lazy_io): unify class lazy_resume_on

feat(mpl): add tuple helper for type_list

build(cmake): add benchmark_clang

fix(co): more typename before dependent type

build(cmake): compat kernel without `__kernel_rwf_t`

fix(cmake): propagate CO_CONTEXT_NO_GENERATOR for headers

line(all): apply clang-format

build(cmake): detect compiler version for co_context::generator