Base dependencies to be used in the playground

[GiregL]

Hi

Since some of the stdlib is moved into separate packages, I thought it could be useful to add those dependencies in the playground, so that we can still use them.
i.e. adding gleam_yielder, gleam_deque and so on.

[lpil]

How would we decide what packages are included? Download counts?

gleam_yielder, and gleam_deque don't seem like very good candidates to me, they are uncommon packages to use.

[GiregL]

Download count could be an indication but with time, big libraries will end up in the playground.

And even if yielder or deque are uncommon, it can be useful to try them before considering using them in projects, or even just to understand how they work

[lpil]

We definitely do not want to direct people towards those packages by default.