add timeout keyword to set-option in the smt2 frontend (#527) #502

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 39s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 38s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 27s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 49s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 56s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 11s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 39s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 12s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 39s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 44s
	1h 2m 54s

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