Move ical-related stuff to rustical_ical crate

crates/ical/Cargo.toml

@@ -5,6 +5,9 @@ edition.workspace = true
 description.workspace = true
 repository.workspace = true
 
+[features]
+actix = ["dep:actix-web"]
+
 [dependencies]
 chrono.workspace = true
 chrono-tz.workspace = true
@@ -17,3 +20,6 @@ regex.workspace = true
 strum.workspace = true
 strum_macros.workspace = true
 rrule = "0.14"
+serde.workspace = true
+sha2.workspace = true
+actix-web = { workspace = true, optional = true }