Moved type stubs into libtorrent directory #3079

Job	Run time
build (asio-debugging=on picker-debugging=on)	5m 4s
pre-commit	49s
build (extensions=off logging=off streaming=off super-seeding=off share-mode=off predictive-piece...	3m 23s
build (crypto=gcrypt)	4m 8s
build (mmap-disk-io=off)	4m 24s
check headers	4m 17s
clang-tidy	9m 47s
build dist (ubuntu-20.04)	2m 39s
build dist (ubuntu-22.04)	2m 53s
Fuzzers	15m 42s
Simulations	13m 59s
Tests (webtorrent=on address-sanitizer=norecover undefined-sanitizer=norecover crypto=openssl)	5m 52s
Tests (toolset=clang logging=off address-sanitizer=norecover undefined-sanitizer=norecover)	12m 3s
Tests (thread-sanitizer=norecover crypto=openssl release debug-symbols=on cxxflags=-Wno-tsan)	5m 46s
Tests (crypto=gnutls)	5m 19s
Tests (deprecated-functions=off)	5m 59s
	1h 42m 4s

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