Sync vs Async

[pedro-devv]

At the moment, some workarounds and shortcuts such as block_in_place and spawn_blocking are used to allow calling blocking functions in asynchronous contexts and simplify the implementation of async counterpart functions. This may not be optimal.

Two things to address with this issue:

• Should sync functions with async counterparts be callable in async contexts?
• Should async function counterparts be fully implemented?

Whatever is decided, it should be consistent across the whole crate. This isn't really a high priority, but should still be kept in mind.