types/events+evidence: emit events + metrics on evidence validation (#7802)

* event: Added Events after evidence validation; evidence: refactored AddEvidence

Added context and Metrics as parameter for the pool constructor

* evidence: pushed event firing into evidence pool and added metrics to represent the size of the evpool

* state: fixed parameters of evpool mock functions

* evidence: added test to confirm events are generated

* Removed obsolete EvidenceEventPublisher interface

* evidence: pool removed error on missing eventbus

node/node_test.go

@@ -298,7 +298,7 @@ func TestCreateProposalBlock(t *testing.T) {
 	// Make EvidencePool
 	evidenceDB := dbm.NewMemDB()
 	blockStore := store.NewBlockStore(dbm.NewMemDB())
-	evidencePool, err := evidence.NewPool(logger, evidenceDB, stateStore, blockStore)
+	evidencePool, err := evidence.NewPool(logger, evidenceDB, stateStore, blockStore, evidence.NopMetrics())
 	require.NoError(t, err)
 
 	// fill the evidence pool with more evidence
@@ -357,7 +357,7 @@ func TestCreateProposalBlock(t *testing.T) {
 	}
 	assert.EqualValues(t, partSetFromHeader.ByteSize(), partSet.ByteSize())
 
-	err = blockExec.ValidateBlock(state, block)
+	err = blockExec.ValidateBlock(ctx, state, block)
 	assert.NoError(t, err)
 }