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/error.rs

@@ -0,0 +1,31 @@
+use thiserror::Error as ThisError;
+
+#[non_exhaustive]
+#[derive(Debug, ThisError)]
+pub enum Error {
+  #[error("Error while parsing")]
+  Parse { err: ParseError, object: String },
+  #[error("Error while formatting")]
+  Format { err: FormatError, object: String },
+}
+
+#[non_exhaustive]
+#[derive(Debug, ThisError)]
+pub enum FormatError {
+  #[error("Time Parse Error: {0}")]
+  Datetime(#[from] time::error::Format),
+}
+#[non_exhaustive]
+#[derive(Debug, ThisError)]
+pub enum ParseError {
+  #[error("Time Parse Error: {0}")]
+  Datetime(#[from] time::error::Parse),
+  #[error("Length of parsed object too long, max: {max:?}, got: {got:?}.")]
+  Length { max: usize, got: usize },
+  #[error("Currently Did is enforced, cannot use handle, {handle:?}")]
+  ForceDid { handle: String },
+  #[error("Incorrectly formatted")]
+  Format,
+}
+
+pub type Result<T> = std::result::Result<T, Error>;