[cherry-picked] abci++: add consensus parameter logic to control vote extension require height (#8547)

This PR makes vote extensions optional within Tendermint. A new ConsensusParams field, called ABCIParams.VoteExtensionsEnableHeight, has been added to toggle whether or not extensions should be enabled or disabled depending on the current height of the consensus engine. Related to: #8453

internal/test/params.go

@@ -0,0 +1,13 @@
+package test
+
+import (
+	"github.com/tendermint/tendermint/types"
+)
+
+// ConsensusParams returns a default set of ConsensusParams that are suitable
+// for use in testing
+func ConsensusParams() *types.ConsensusParams {
+	c := types.DefaultConsensusParams()
+	c.ABCI.VoteExtensionsEnableHeight = 1
+	return c
+}