feat(pubsub): complete AckResult for exactly once (#6387)

* refactor sendAck to pipe errors to AckResult map

* rewrite sendAck/sendModAck for exactly once

* add AckResult to list of uncompared methods

* use ackResultWithID in all locations

pubsub/go.mod

@@ -3,7 +3,7 @@ module cloud.google.com/go/pubsub
 go 1.15
 
 require (
-	cloud.google.com/go v0.102.1-0.20220615234935-19a5d218ec4d
+	cloud.google.com/go v0.102.1-0.20220708235547-f3d2cc2c987e
 	cloud.google.com/go/iam v0.3.0
 	cloud.google.com/go/kms v1.4.0
 	github.com/golang/protobuf v1.5.2

pubsub/go.sum

@@ -30,6 +30,8 @@ cloud.google.com/go v0.100.1/go.mod h1:fs4QogzfH5n2pBXBP9vRiU+eCny7lD2vmFZy79Iuw
 cloud.google.com/go v0.100.2/go.mod h1:4Xra9TjzAeYHrl5+oeLlzbM2k3mjVhZh4UqTZ//w99A=
 cloud.google.com/go v0.102.1-0.20220615234935-19a5d218ec4d h1:29ZuPdUkhuJw9mwHi6zVYkJRHq956wJ5G9OQUbWl5Ew=
 cloud.google.com/go v0.102.1-0.20220615234935-19a5d218ec4d/go.mod h1:mqs3bFXrt/gPc6aOZpchX8DEdQhuJluA/7LZNutd2Nc=
+cloud.google.com/go v0.102.1-0.20220708235547-f3d2cc2c987e h1:GZ9rHNbN2TY+p6/dTeU0EADYrOc3BCqy/KwGPZHLsdA=
+cloud.google.com/go v0.102.1-0.20220708235547-f3d2cc2c987e/go.mod h1:mqs3bFXrt/gPc6aOZpchX8DEdQhuJluA/7LZNutd2Nc=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=