ref(quotas): Split crate types into submodules (#600)

Refactors `relay-quotas` without any functional changes and adds a few
tests.

relay-quotas/Cargo.toml

@@ -11,7 +11,7 @@ publish = false
 
 [features]
 default = []
-rate-limiter = [
+redis = [
     "failure",
     "log",
     "relay-redis/impl",

relay-quotas/src/legacy.rs

@@ -8,7 +8,7 @@
 use serde::{ser::SerializeSeq, Deserialize, Deserializer, Serialize, Serializer};
 use smallvec::smallvec;
 
-use crate::types::{DataCategory, Quota, QuotaScope, ReasonCode};
+use crate::quota::{DataCategory, Quota, QuotaScope, ReasonCode};
 
 /// Legacy format of the `Quota` type.
 #[derive(Deserialize, Serialize)]

relay-quotas/src/lib.rs

@@ -2,13 +2,20 @@
 
 #![warn(missing_docs)]
 
-mod types;
-pub use self::types::*;
+/// The default timeout to apply when a scope is fully rejected. This
+/// typically happens for disabled keys, projects, or organizations.
+const REJECT_ALL_SECS: u64 = 60;
+
+mod quota;
+mod rate_limit;
+
+pub use self::quota::*;
+pub use self::rate_limit::*;
 
 #[cfg(feature = "legacy")]
 pub mod legacy;
 
-#[cfg(feature = "rate-limiter")]
-mod rate_limiter;
-#[cfg(feature = "rate-limiter")]
-pub use self::rate_limiter::*;
+#[cfg(feature = "redis")]
+mod redis;
+#[cfg(feature = "redis")]
+pub use self::redis::*;