feat: add ChannelRss

- add documentation
- small model refactor: rename player VideoPlayerDetails.thumbnails to thumbnail

Cargo.toml

@@ -14,7 +14,9 @@ members = [".", "codegen", "cli"]
 
 [features]
 default = ["default-tls"]
+all = ["rss", "html"]
 
+rss = ["quick-xml"]
 html = ["askama_escape"]
 
 # Reqwest TLS
@@ -44,6 +46,7 @@ filenamify = "0.1.0"
 ress = "0.11.4"
 phf  = "0.11.1"
 askama_escape = {version = "0.10.3", optional = true}
+quick-xml = {version = "0.25.0", features = ["serialize"], optional = true}
 
 [dev-dependencies]
 env_logger = "0.9.0"