[STREAM-689] Use Builder for InflightActivation (#523)

* Add Builders for `TaskActivation` and `InflightActivation`

* Refactor Some `InflightActivation` Literals

* Replace More `InflightActivation` Literals

* Reduce `TaskActivation` Builder Boilerplate w/Macros

* Infer `TaskActivation` Values from `InflightActivationBuilder`

* Minor Fixes

* Remove Custom Received Setter

* Move Builders to Separate File

* Remove Extra Line

Author: george-sentry

Cargo.lock

@@ -14,6 +14,7 @@ async-trait = "0.1"
 bytes = "1.10.0"
 chrono = { version = "0.4.26" }
 clap = { version = "4.5.20", features = ["derive"] }
+derive_builder = "0.20.2"
 elegant-departure = { version = "0.3.1", features = ["tokio"] }
 figment = { version = "0.10.19", features = ["env", "yaml", "test"] }
 futures = "0.3.31"