Add virtual destructors to MongoServiceAdaptor and SpanFilter #1210

Job	Run time
gcc-compile-with-cmake	3m 17s
gcc-compile-with-make	2m 48s
clang-compile-with-bazel	14m 52s
clang-compile-with-cmake	3m 3s
clang-compile-with-make	2m 29s
gcc-compile-with-bazel	16m 7s
gcc-compile-with-bazel-all-options	19m 1s
gcc-compile-with-boringssl	20m 2s
gcc-compile-with-cmake-all-options	5m 2s
gcc-compile-with-make-all-options	4m 48s
clang-compile-with-boringssl	20m 12s
clang-compile-with-bazel-all-options	16m 56s
clang-compile-with-cmake-all-options	5m 8s
clang-compile-with-make-all-options	4m 43s
clang-unittest	14m 22s
	2h 32m 50s

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