[WIP][Build] Enable C++20 toolchain baseline (#79260)

• Enable C++20 toolchain baseline

• Fix C++20 CI baseline regressions

• Lower GCC C++20 baseline to 11

• Force CUDA C++20 CI exposure

• Patch Crypto++ for C++20 constructor syntax

• Fix AP type constructor for C++20

• Fix C++20 accumulate lambda in cum maxmin

• Fix PIR attribute checks for C++20

• Fix Windows C++20 compile errors

• Use std numbers for angle constant

• Fix CUDA angle constant for C++20

• Fix distributed PIR null checks for C++20

• Fix DDim visitor return type for nvcc

• Update Windows C++20 CI toolchain

• Keep Windows builds on C++17 baseline

• Document Windows C++20 follow-up

• Guard std numbers usage for Windows C++17

• Link static PIR deps for CUDA tests

• Fallback to C++17 for older GCC

• Warn on GCC C++17 fallback

• Link nv tests with static registry deps

• Fix C++17 numbers fallback and nv test deps

• Fix C++20 coverage build errors

• Link nv tests with registry deps

• Link phi core after nv test registry deps

• Link var helper with type info

• Group var helper with nv test type info deps

• Keep var helper type info link order

• Narrow AP attr TypeId probing

• Group paddle gtest static deps

• Avoid null check ambiguity for PIR type

• Fix C++20 accumulate callbacks in inference tests

• Remove global paddle gtest static deps

• Preserve AP attribute matching with TypeId deps

• Localize static deps for GPU tests

• Fix threadpool patch application