Faucet: repurpose cap and slice args to apply to single IPs (bp #16381) (#16400)

* Faucet: repurpose cap and slice args to apply to single IPs (#16381)

* Single use stmt

* Log request IP

* Switch cap and slice to apply per IP

* Use SOL in logs, error msgs

* Use thiserror instead of overloading io::Error

* Return memo transaction for requests that exceed per-request-cap

* Handle faucet memos in cli

* Add some docs, esp about memo transaction

* Use SOL symbol & standardize memo

Co-authored-by: Michael Vines <mvines@gmail.com>

* Differentiate faucet tx-length errors

* Populate signature in cli airdrop memo case

Co-authored-by: Michael Vines <mvines@gmail.com>
(cherry picked from commit 03d3ae1cb9)

# Conflicts:
#	Cargo.lock
#	client/Cargo.toml
#	faucet/Cargo.toml

* Fix conflicts

Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

client/src/client_error.rs

@@ -1,5 +1,6 @@
 use {
     crate::rpc_request,
+    solana_faucet::faucet::FaucetError,
     solana_sdk::{
         signature::SignerError, transaction::TransactionError, transport::TransportError,
     },
@@ -23,6 +24,8 @@ pub enum ClientErrorKind {
     SigningError(#[from] SignerError),
     #[error(transparent)]
     TransactionError(#[from] TransactionError),
+    #[error(transparent)]
+    FaucetError(#[from] FaucetError),
     #[error("Custom: {0}")]
     Custom(String),
 }
@@ -46,6 +49,7 @@ impl From<ClientErrorKind> for TransportError {
             ClientErrorKind::RpcError(err) => Self::Custom(format!("{:?}", err)),
             ClientErrorKind::SerdeJson(err) => Self::Custom(format!("{:?}", err)),
             ClientErrorKind::SigningError(err) => Self::Custom(format!("{:?}", err)),
+            ClientErrorKind::FaucetError(err) => Self::Custom(format!("{:?}", err)),
             ClientErrorKind::Custom(err) => Self::Custom(format!("{:?}", err)),
         }
     }
@@ -162,4 +166,13 @@ impl From<TransactionError> for ClientError {
     }
 }
 
+impl From<FaucetError> for ClientError {
+    fn from(err: FaucetError) -> Self {
+        Self {
+            request: None,
+            kind: err.into(),
+        }
+    }
+}
+
 pub type Result<T> = std::result::Result<T, ClientError>;