add get_balance #201

Job	Run time
lib_android (monero)	25m 8s
lib_android (wownero)	26m 51s
lib_darwin (monero)	13m 28s
lib_darwin (wownero)	13m 29s
ios build (monero)	14m 7s
ios build (wownero)	12m 27s
lib_linux (monero)	30m 9s
lib_linux (wownero)	29m 54s
macos build (monero)	3m 5s
macos build (wownero)	3m 19s
lib_mingw (monero)	3m 16s
lib_mingw (wownero)	3m 13s
lib_sailfishos_aarch64 (monero)	2m 56s
lib_sailfishos_i486 (monero)	2m 30s
lib_sailfishos_i486 (wownero)	1m 52s
lib_sailfishos_aarch64 (wownero)	3m 14s
regression_check (monero)	3m 24s
create single release file	31s
comment on pr	7s
test ts library	1m 3s
regression_check (wownero)	2m 31s
	3h 16m 34s

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