eventstore: replace bluge with bleve.

bluge seems to be abandoned and bleve should work better, who knows.

eventstore/bleve/save.go

@@ -0,0 +1,23 @@
+package bleve
+
+import (
+	"fmt"
+	"strconv"
+
+	"fiatjaf.com/nostr"
+)
+
+func (b *BleveBackend) SaveEvent(evt nostr.Event) error {
+	doc := map[string]interface{}{
+		contentField:   evt.Content,
+		kindField:      strconv.Itoa(int(evt.Kind)),
+		pubkeyField:    evt.PubKey.Hex()[56:],
+		createdAtField: float64(evt.CreatedAt),
+	}
+
+	if err := b.index.Index(evt.ID.Hex(), doc); err != nil {
+		return fmt.Errorf("failed to index '%s' document: %w", evt.ID, err)
+	}
+
+	return nil
+}