go bindings for watchman.

Commands

Command	Implemented	Notes
clock	✅
find	✅
flush-subscriptions	❌
get-config	❌
get-sockname	❌
list-capabilities	❌
log	❌
log-level	✅
query	❌
shutdown-server	❌
since	❌
state-enter	❌
state-leave	❌
subscribe	✅
trigger	❌
trigger-del	❌
trigger-list	❌
unsubscribe	✅
version	✅
watch	✅
watch-del	✅
watch-del-all	✅
watch-list	✅
watch-project	✅