Add urUSMPoolFree function to spec #2006

Job	Run time
Build - MacOS (macos-12)	15m 32s
Build - MacOS (macos-13)	6m 16s
Build - Windows (windows-2019, Debug)	1s
Build - Windows (windows-2019, Release)	1s
Build - Windows (windows-2022, Debug)	4m 17s
Build - Windows (windows-2022, Release)	5m 59s
Build - Ubuntu (ubuntu-20.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	1s
Build - Ubuntu (ubuntu-20.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	4m 48s
Build - Ubuntu (ubuntu-20.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	1s
Build - Ubuntu (ubuntu-20.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	1s
Build - Ubuntu (ubuntu-22.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	1s
Build - Ubuntu (ubuntu-22.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	2m 52s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	1s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	1s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	1s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON)	1s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON)	1s
Build - Ubuntu (ubuntu-20.04, Release, gcc-7, g++-7)	1s
	39m 56s

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