Revise release process

[spenserblack]

Currently, each package is released at the same time, and they all have the same
version via version.workspace = true. Now that the languages definition is
a separate crate, it will likely get updated much more frequently than gengo or
gengo-bin.

Rather than release all crates at once, perhaps tags can have a prefix with the crate
name. For example, languages-x.y.z to publish specifically the languages crate.

Possibly related: #616