Add --dry-run release

[adespawn]

@wprzytula Some thought here: since we are releasing multiple packages (1 main + 1 / architecture) maybe we want to have a separate step that releases all the packages in the dry-run mode, to increase the chances we release all the packages atomically?

Doing dry run should be able to catch most of the problems from our end, so (in theory) the only chance the full run could fail later, would be infrastructure problems: ex. npm dying in the middle of release process

Originally posted by @adespawn in #402 (comment)