Atproto, types overhaul and error handling

Breaks off from Atrium-rs's types because they are implemented
inconsistently, which makes them harder to use.

This was done with reference to the atproto documentation but
specifically not the atrium-rs codebase so I wouldn't have to think
about licenses.

This adds the types and error module in atproto. It also touches
Cargo.toml for some new dependencies and some shared dependencies. It
required thiserror, so I looped that into the workspace meaning that
this commit touches db.

some things to keep in mind:
- There is no CID parsing
- None of this is tested, nor are there any tests written. We're playing
  fast and loose baby~

atproto/src/lib.rs

@@ -1,80 +1,3 @@
-use lazy_regex::regex_captures;
-use core::str::FromStr;
-use std::fmt::{
-  Display, Formatter, Result as FmtResult
-};
-
-pub use atrium_api::types::{
-  Collection,
-  string::{
-    AtIdentifier as Authority,
-    Datetime,
-    Did,
-    Nsid,
-    RecordKey,
-    Tid,
-    Handle,
-  }
-};
-
 pub mod lexicons;
-
-pub struct Cid(String);
-
-impl Display for Cid {
-    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
-        write!(f, "{}", self.0)
-    }
-}
-
-pub struct StrongRef<T> {
-  pub content: T,
-  pub cid: Cid,
-}
-
-pub struct Uri {
-  whole: String,
-  // These fields could be useful in the future, 
-  // so I'm leaving the code for them.
-  // authority: Authority,
-  // collection: Option<Nsid>,
-  // rkey: Option<RecordKey>,
-}
-
-impl FromStr for Uri {
-  type Err = &'static str;
-  fn from_str(uri: &str) -> Result<Self, Self::Err> {
-    if uri.len() > 8000 {
-      return Err("Uri too long")
-    }
-
-    let Some((
-      whole, unchecked_authority, unchecked_collection, unchecked_rkey
-    )) = regex_captures!(
-      r"/^at:\/\/([\w\.\-_~:]+)(?:\/([\w\.\-_~:]+)(?:)\/([\w\.\-_~:]+))?$/i",
-      uri,
-    ) else { 
-      return Err("Invalid Uri"); 
-    };
-
-    // This parsing is required, but the values don't need to be used yet.
-    // No compute cost to use them, just storage cost
-    let _authority = Authority::from_str(unchecked_authority)?;
-
-    let _collection = if unchecked_collection.is_empty() { None }
-      else { Some(Nsid::new(unchecked_collection.to_string())?) };
-
-    let _rkey = if unchecked_rkey.is_empty() { None }
-      else { Some(RecordKey::new(unchecked_rkey.to_string())?) };
-
-    // Ok(Uri{ whole: whole.to_string(), authority, collection, rkey })
-    Ok(Uri { whole: whole.to_string() })
-  }
-}
-
-impl Uri {
-  pub fn as_str(&self) -> &str {
-    self.whole.as_str()
-  }
-}
-
+pub mod types;
+pub mod error;