eth/filters: ✨ pending logs ✨

Pending logs are now filterable through the Go API. Filter API changed
such that each filter type has it's own bucket and adding filter
explicitly requires you specify the bucket to put it in.

eth/filters/filter.go

@@ -18,6 +18,7 @@ package filters
 
 import (
 	"math"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
@@ -32,6 +33,8 @@ type AccountChange struct {
 
 // Filtering interface
 type Filter struct {
+	created time.Time
+
 	db         ethdb.Database
 	begin, end int64
 	addresses  []common.Address