Temporarily increase the size of allowed transfers

We need to evaluate what is the best solution here, increasing the
allowed transfer size, or instead solving the problem in the protocol
level but chunking big transfers.

At the moment, we increase the allowed size so that we can make
progress.

Signed-off-by: Babis Chalios <mail@bchalios.io>

src/proto.rs

@@ -16,7 +16,7 @@ use protobuf::{CodedInputStream, CodedOutputStream};
 use crate::error::{get_rpc_status, Error, Result as TtResult};
 
 pub const MESSAGE_HEADER_LENGTH: usize = 10;
-pub const MESSAGE_LENGTH_MAX: usize = 4 << 20;
+pub const MESSAGE_LENGTH_MAX: usize = 1 << 30;
 pub const DEFAULT_PAGE_SIZE: usize = 4 << 10;
 
 pub const MESSAGE_TYPE_REQUEST: u8 = 0x1;