Implement encrypted transaction caching for GoCardless adapter

- Reduces GoCardless API calls by up to 99% through intelligent caching of transaction data
- Secure AES-GCM encryption with PBKDF2 key derivation (200k iterations) for at-rest storage
- Automatic range merging and transaction deduplication to minimize storage and API usage
- Cache-first approach with automatic fetching of uncovered date ranges
- Comprehensive test suite with 30 unit tests covering all cache operations and edge cases
- Thread-safe implementation with in-memory caching and encrypted disk persistence

Cache everything Gocardless sends back

gocardless-client/src/models.rs

@@ -59,10 +59,24 @@ pub struct TransactionBookedPending {
 pub struct Transaction {
     #[serde(rename = "transactionId")]
     pub transaction_id: Option<String>,
+    #[serde(rename = "entryReference")]
+    pub entry_reference: Option<String>,
+    #[serde(rename = "endToEndId")]
+    pub end_to_end_id: Option<String>,
+    #[serde(rename = "mandateId")]
+    pub mandate_id: Option<String>,
+    #[serde(rename = "checkId")]
+    pub check_id: Option<String>,
+    #[serde(rename = "creditorId")]
+    pub creditor_id: Option<String>,
     #[serde(rename = "bookingDate")]
     pub booking_date: Option<String>,
     #[serde(rename = "valueDate")]
     pub value_date: Option<String>,
+    #[serde(rename = "bookingDateTime")]
+    pub booking_date_time: Option<String>,
+    #[serde(rename = "valueDateTime")]
+    pub value_date_time: Option<String>,
     #[serde(rename = "transactionAmount")]
     pub transaction_amount: TransactionAmount,
     #[serde(rename = "currencyExchange")]
@@ -71,14 +85,32 @@ pub struct Transaction {
     pub creditor_name: Option<String>,
     #[serde(rename = "creditorAccount")]
     pub creditor_account: Option<AccountDetails>,
+    #[serde(rename = "ultimateCreditor")]
+    pub ultimate_creditor: Option<String>,
     #[serde(rename = "debtorName")]
     pub debtor_name: Option<String>,
     #[serde(rename = "debtorAccount")]
     pub debtor_account: Option<AccountDetails>,
+    #[serde(rename = "ultimateDebtor")]
+    pub ultimate_debtor: Option<String>,
     #[serde(rename = "remittanceInformationUnstructured")]
     pub remittance_information_unstructured: Option<String>,
+    #[serde(rename = "remittanceInformationUnstructuredArray")]
+    pub remittance_information_unstructured_array: Option<Vec<String>>,
+    #[serde(rename = "remittanceInformationStructured")]
+    pub remittance_information_structured: Option<String>,
+    #[serde(rename = "remittanceInformationStructuredArray")]
+    pub remittance_information_structured_array: Option<Vec<String>>,
+    #[serde(rename = "additionalInformation")]
+    pub additional_information: Option<String>,
+    #[serde(rename = "purposeCode")]
+    pub purpose_code: Option<String>,
+    #[serde(rename = "bankTransactionCode")]
+    pub bank_transaction_code: Option<String>,
     #[serde(rename = "proprietaryBankTransactionCode")]
     pub proprietary_bank_transaction_code: Option<String>,
+    #[serde(rename = "internalTransactionId")]
+    pub internal_transaction_id: Option<String>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -102,4 +134,10 @@ pub struct CurrencyExchange {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AccountDetails {
     pub iban: Option<String>,
+    pub bban: Option<String>,
+    pub pan: Option<String>,
+    #[serde(rename = "maskedPan")]
+    pub masked_pan: Option<String>,
+    pub msisdn: Option<String>,
+    pub currency: Option<String>,
 }