Feat: transaction get solid now

packages/binary/serialize/serialized_object.go

packages/binary/spammer/spammer.go

packages/binary/storageprefix/storageprefix.go

packages/binary/tangle/events.go

...e/model/transactionmetadata/cached_transactionmetadata.go

packages/binary/tangle/model/transactionmetadata/proto.go

...y/tangle/model/transactionmetadata/transactionmetadata.go

packages/binary/tangle/tangle_test.go

plugins/autopeering/autopeering.go

plugins/config/config.go

plugins/gossip/gossip.go

plugins/tangle/plugin.go

plugins/webapi/spammer/plugin.go