[pkg] add missing changes files

client/changes/bug_move-sync-db-and-encpool-creation-to-api

+o bugfix: move sync db and encpool creation to api.

client/changes/bug_wrong-sqlcipher-passphrase-now-raises-correctly

+o Bugfix: wrong sqlcipher passphrase now raises correctly.

client/changes/pkg_improved-scripts-and-deps

+o Improve helper scripts and dependencies listing.

client/changes/style_lots-of-style-changes

+o Lots of code restyling to pass CI tests.