proto: implement json rendering of move values

Using the move layout Visitor infrastructure, implement json rendering
of arbitrary move values which can then be embedded in protobuf messages
using google.protobuf.Value.

Author: bmwill

Cargo.lock

@@ -14,6 +14,7 @@ async-trait.workspace = true
 anemo.workspace = true
 anyhow.workspace = true
 bincode.workspace = true
+base64.workspace = true
 bcs.workspace = true
 byteorder.workspace = true
 bytes.workspace = true
@@ -26,6 +27,7 @@ nonempty.workspace = true
 once_cell.workspace = true
 prometheus.workspace = true
 prost.workspace = true
+prost-types.workspace = true
 rand.workspace = true
 serde.workspace = true
 serde-name.workspace = true

crates/sui-types/Cargo.toml

@@ -73,6 +73,7 @@ pub mod nitro_attestation;
 pub mod object;
 pub mod passkey_authenticator;
 pub mod programmable_transaction_builder;
+pub mod proto_value;
 pub mod quorum_driver_types;
 pub mod randomness_state;
 pub mod signature;

crates/sui-types/src/lib.rs

@@ -557,7 +557,7 @@ pub(crate) mod tests {
     }
 
     /// BCS encode Move value.
-    fn serialize(value: A::MoveValue) -> Vec<u8> {
+    pub(crate) fn serialize(value: A::MoveValue) -> Vec<u8> {
         value.clone().undecorate().simple_serialize().unwrap()
     }
 }