v0.16: Expand Config program; implement Validator Info CLI (#5045)

* Update config program to accommodate multiple signers (#4946)

* Update config program to accommodate multiple signers

* Update install CLI

* Remove account_type u32; add handling for unsigned keys in list

* ConfigKeys doc

* Make config_api more robust (#4980)

* Make config_api more robust

* Add test and update store instruction

* Improve signature checks in config_api (#5001)

automerge

* Add validator-info CLI (#4970)

* Add validator-info CLI

* Add GetProgramAccounts method to solana-client

* Update validator-info args, and add get subcommand

* Update ValidatorInfo lengths

* Add account filter for get --all

* Update testnet participation doc to reflect validator-info

* Flesh out tests

* Review comments

client/src/rpc_request.rs

@@ -10,6 +10,7 @@ pub enum RpcRequest {
     GetBalance,
     GetClusterNodes,
     GetNumBlocksSinceSignatureConfirmation,
+    GetProgramAccounts,
     GetRecentBlockhash,
     GetSignatureStatus,
     GetSlot,
@@ -38,6 +39,7 @@ impl RpcRequest {
             RpcRequest::GetNumBlocksSinceSignatureConfirmation => {
                 "getNumBlocksSinceSignatureConfirmation"
             }
+            RpcRequest::GetProgramAccounts => "getProgramAccounts",
             RpcRequest::GetRecentBlockhash => "getRecentBlockhash",
             RpcRequest::GetSignatureStatus => "getSignatureStatus",
             RpcRequest::GetSlot => "getSlot",