This patch move the entities module to a helper-crate.
With this, we give the user the opportunity to use only the entities
types in their codebase, if need be.
One scenario where this is required came up in
https://github.com/dscottboggs/mastodon-async/issues/38
TL;DR is: A user needed to be able to pass types like `Status` from a
backend part of an application to a frontend which was compiled to WASM.
Because mastodon_async depends on tokio, which does not compile to WASM
(at least not with the features required by mastodon_async).
One option would have been to provide types in the application code
which can be constructed from mastodon_asyncs entity types. This would
lead to _a lot_ of code duplication (over several projects still,... but
that's rather undesireable anyways).
The solution mastodon_async offers with this patch is a helper-crate
which only contains the entity types: mastodon_async_entities.
mastodon_async publicly exports the whole mastodon_async_entities crate,
so users do not have to depend on the latter directly.
In addition to the `entities` module from mastodon_async, also the
`Visibility` type had to be moved.
`mastodon_async_entities` also got an own `Error` type, which
`mastodon_async::Error` can of course wrap.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
Suggested-by: D. Scott Boggs <scott@tams.tech>
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