Add `poller_t::wait` #239

Job	Run time
tests (ubuntu-22.04, 98, gcc-10, g++-10, ON, OFF, 4.3.5, cmake)	1m 1s
tests (ubuntu-22.04, 20, gcc-10, g++-10, ON, OFF, 4.3.5, cmake)	1m 16s
tests (ubuntu-22.04, 17, gcc-11, g++-11, ON, ON, 4.3.5, cmake, -DCOVERAGE=ON, lcov)	1m 15s
tests (ubuntu-24.04, 23, gcc-13, g++-13, OFF, 4.3.5, cmake)	1m 17s
tests (ubuntu-22.04, 11, gcc-10, g++-10, ON, OFF, 4.3.5, cmake)	1m 11s
tests (ubuntu-22.04, 11, gcc-11, g++-11, OFF, 4.2.0, pkgconfig)	1m 17s
tests (ubuntu-22.04, 17, clang-14, clang++-14, ON, 4.3.5, cmake)	1m 16s
tests (windows-2022, 20, msbuild, msbuild, ON, 4.3.5, cmake, -Ax64)	1m 20s
tests (ubuntu-24.04, 23, gcc-13, g++-13, ON, 4.3.5, cmake)	1m 16s
tests (macos-latest, 17, clang, clang++, OFF, 4.3.5, false, zeromq)	55s
	12m 4s

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