add timeout keyword to set-option in the smt2 frontend #501

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 31s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 38s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 18s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 57s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 41s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 13s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 53s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 18s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 24s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 34s
	1h 2m 27s

Provide feedback