client-api: Add support for the Retry-After header

According to MSC4041 / Matrix 1.10

Co-authored-by: Jonas Platte <[email protected]>

crates/ruma-client-api/CHANGELOG.md

@@ -16,6 +16,9 @@ Breaking changes:
 - `Error` is now non-exhaustive.
 - `ErrorKind::Forbidden` is now a non-exhaustive struct variant that can be
   constructed with `ErrorKind::forbidden()`.
+- The `retry_after_ms` field of `ErrorKind::LimitExceeded` was renamed to
+  `retry_after` and is now an `Option<RetryAfter>`, to add support for the
+  Retry-After header, according to MSC4041 / Matrix 1.10 
 
 Improvements:
 

crates/ruma-client-api/Cargo.toml

@@ -52,6 +52,7 @@ unstable-msc3983 = []
 as_variant = { workspace = true }
 assign = { workspace = true }
 bytes = "1.0.1"
+date_header = "1.0.5"
 http = { workspace = true }
 js_int = { workspace = true, features = ["serde"] }
 js_option = "0.1.1"
@@ -61,6 +62,8 @@ ruma-events = { workspace = true }
 serde = { workspace = true }
 serde_html_form = { workspace = true }
 serde_json = { workspace = true }
+thiserror = { workspace = true }
+web-time = { workspace = true }
 
 [dev-dependencies]
 assert_matches2 = { workspace = true }