serde the full FeeCalculator (#4778)

automerge

core/src/rpc.rs

@@ -768,6 +768,8 @@ mod tests {
             "jsonrpc": "2.0",
             "result": [ blockhash.to_string(), {
                 "lamportsPerSignature": 0,
+                "maxLamportsPerSignature": 0,
+                "minLamportsPerSignature": 0,
                 "targetLamportsPerSignature": 0,
                 "targetSignaturesPerSlot": 0
             }],

sdk/src/fee_calculator.rs

@@ -17,9 +17,7 @@ pub struct FeeCalculator {
     // for the next slot.  A value of 0 disables lamports_per_signature fee adjustments
     pub target_signatures_per_slot: usize,
 
-    #[serde(skip)]
     pub min_lamports_per_signature: u64,
-    #[serde(skip)]
     pub max_lamports_per_signature: u64,
 }