Add `vote` and `seconded` events to Democracy pallet. (#10352)

* add the events

* spec_version

* Update bin/node/runtime/src/lib.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

Co-authored-by: Alan Sapede <alan.sapede@gmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>