Docs: Write JavaDoc for RequestContext

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/parser/RequestContext.java

@@ -2,4 +2,13 @@ package ch.unibas.dmi.dbis.cs108.casono.server.network.parser;
 
 import ch.unibas.dmi.dbis.cs108.casono.server.network.sessions.SessionId;
 
+/**
+ * Immutable context for a network request.
+ *
+ * <p>Contains the originating session's identifier and the request's id. Later used to create
+ * response.
+ *
+ * @param sessionId the identifier of the session that initiated the request
+ * @param requestId the request's numeric id within the session
+ */
 public record RequestContext(SessionId sessionId, int requestId) {}