overhaul this crate's interface

[jbr]

• Remove interior mutability inside of Session
• store values in memory as serde_json::Values instead of strings
• add Session::take_value
• use dashmap in MemoryStore
• add an Error associated type instead of using anyhow
• remove reexported but unused libraries
• make memory-store and cookie-store cargo features (currently enabled by default)
• upgrade base64

I plan to leave this open for a few days and merge if there are no concerns

[MOZGIII]

Consider extracting the memory-store and cookie-store into separate crates. They seem to be fairly standalone to allow it, and this way you can control the dependencies more explicitly.

[maxcountryman]

It would be nice if v4 could also address the issue of not being able to clone without blowing away the session value. axum-sessions works around this by using RWLock but this interface is far from ideal. If libraries had some escape hatch to clone without destroying the value that would be helpful.

[maxcountryman]

@jbr do you have a sense for when this might be merged and released?

[kaiserbh]

Hi @jbr I hope you been well, I was just wondering if this is ready to be merged or is there anything that's blocking this from getting merged?

[maxcountryman]

If I can donate my time to help with the maintenance of this crate I'd be more than happy to. Let me know if that would be helpful, @jbr.