New option: Blocking slotmap updates after initial async connect #429

Job	Run time
Run static checkers	41s
Installation tests	28s
macOS	56s
Build for 32-bit	30s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer=""]	2m 37s
Build with make	2m 39s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="thread"]	2m 51s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="undefined"]	2m 56s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="leak"]	2m 48s
Windows	3m 35s
Windows (MinGW64)	54s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="address"]	2m 48s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer=""]	2m 48s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="thread"]	3m 14s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="undefined"]	2m 53s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="leak"]	3m 0s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="address"]	3m 4s
Build with CMake [Debug, clang-18, cmake-3.29, sanitizer=""]	2m 57s
Build with CMake [Release, gcc-7, cmake-3.13, sanitizer=""]	4m 12s
Build with CMake [Release, clang-12, cmake-3.13, sanitizer=""]	5m 30s
	51m 21s

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