ENT-12414: Use `librsync`'s Stream API in `GET <FILENAME>` requests #1662

Job	Run time
unit_tests / Run Unit Tests	3m 43s
shellcheck_tests / Run shellcheck on shell scripts	1m 6s
acceptance_tests / acceptance_tests	31m 35s
macos_unit_tests / macos_unit_tests	3m 7s
static_check / static_check	8m 41s
asan_unit_tests / asan_unit_tests	2m 59s
valgrind_tests / valgrind_tests	5m 38s
valgrind_check / valgrind_check	5m 15s
windows_acceptance_tests / windows_acceptance_tests	6h 0m 13s
	7h 2m 17s

Provide feedback