Support loading arbitrary engines via ENGINE_by_id() #734

Job	Run time
build (ubuntu-22.04, x64-linux, gcc, ubuntu-22.04, Unix Makefiles)	42s
build (windows-x86-vs, x86-windows, vs, x86, windows-latest, Ninja, C:/vcpkg, C:/Users/runneradmi...	8m 53s
build (windows-x64-vs, x64-windows, vs, x64, windows-latest, Ninja, C:/vcpkg, C:/Users/runneradmi...	6m 59s
build (macOS, arm64-osx, clang, macOS-latest, Unix Makefiles, /usr/local/share/vcpkg, /Users/runn...	1m 6s
build (ubuntu-24.04, x64-linux, gcc, ubuntu-24.04, Unix Makefiles)	32s
build (windows-x64-static-vs, x64-windows-static, vs, x64, windows-latest, Ninja, C:/vcpkg, C:/Us...	8m 59s
build (windows-x64-mingw, x64-windows, mingw, windows-latest, Ninja, C:/vcpkg, C:/Users/runneradm...	7m 43s
	34m 54s

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