types: add new consensus params from proto (#7354)

This change adds the new TimingParams proto messages. These new messages were build using the wb/proposer-based-timestamps branch on the spec repo.
This change also adds validation that these values are positive when parsed and adds the new parameters into the existing tests.

config/toml.go

@@ -569,6 +569,10 @@ var testGenesisFmt = `{
 			"max_gas": "-1",
 			"time_iota_ms": "10"
 		},
+		"timing": {
+			"message_delay": "200",
+			"precision": "50"
+		},
 		"evidence": {
 			"max_age_num_blocks": "100000",
 			"max_age_duration": "172800000000000",