change(rpc): add submitblock RPC method

zebra-rpc/src/errors.rs

@@ -1,5 +1,9 @@
 use jsonrpc_core::types::error::{Error, ErrorCode};
 
+/// Returns a jsonrpc_core [`Error`] with an [`ErrorCode::ServerError(0)`]
+/// with the provided message.
+// TODO: Remove the feature flag and replace repetitive closures passed to `map_err`
+//       in rpc methods.
 pub(crate) fn make_server_error(message: impl std::fmt::Display) -> Error {
     Error {
         code: ErrorCode::ServerError(0),

zebra-rpc/src/lib.rs

@@ -5,6 +5,7 @@
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_rpc")]
 
 pub mod config;
+#[cfg(feature = "getblocktemplate-rpcs")]
 mod errors;
 pub mod methods;
 pub mod queue;