refactor xmr rate module to exchange rate module for multi crypto support

backend/src/modules/exchangeRate/const/coinPaprikaIds.ts

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+import type { ExchangeRatePaymentMethod } from './exchangeRatePaymentMethods';
+import { PaymentMethod } from '../../payment/types/PaymentMethod';
+
+export const COINPAPRIKA_ID_BY_PAYMENT_METHOD = {
+    [PaymentMethod.Xmr]: 'xmr-monero',
+    [PaymentMethod.Btc]: 'btc-bitcoin'
+} as const satisfies Record<ExchangeRatePaymentMethod, string>;

backend/src/modules/exchangeRate/const/coingeckoIds.ts

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+import type { ExchangeRatePaymentMethod } from './exchangeRatePaymentMethods';
+import { PaymentMethod } from '../../payment/types/PaymentMethod';
+
+export const COINGECKO_ID_BY_PAYMENT_METHOD = {
+    [PaymentMethod.Xmr]: 'monero',
+    [PaymentMethod.Btc]: 'bitcoin'
+} as const satisfies Record<ExchangeRatePaymentMethod, string>;

backend/src/modules/exchangeRate/const/exchangeRatePaymentMethods.ts

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+import { PaymentMethod } from '../../payment/types/PaymentMethod';
+
+export const EXCHANGE_RATE_PAYMENT_METHODS = [PaymentMethod.Xmr, PaymentMethod.Btc] as const;
+
+export type ExchangeRatePaymentMethod = (typeof EXCHANGE_RATE_PAYMENT_METHODS)[number];