optimization on the client steel scripts3 - removing datafusion from the steel dependencies

common/proto/currency_conversion.proto

@@ -0,0 +1,53 @@
+syntax = "proto3";
+package komp_ac.currency_conversion;
+
+service CurrencyConversion {
+  rpc ConvertCurrency(ConvertCurrencyRequest) returns (ConvertCurrencyResponse);
+  rpc ResolveRate(ResolveRateRequest) returns (ResolvedFxRate);
+  rpc ListRequiredCurrencies(ListRequiredCurrenciesRequest)
+      returns (ListRequiredCurrenciesResponse);
+}
+
+message ConvertCurrencyRequest {
+  string amount = 1;
+  string source_currency = 2;
+  string target_currency = 3;
+  string source = 4;
+  string as_of_date = 5;
+}
+
+message ResolveRateRequest {
+  string source_currency = 1;
+  string target_currency = 2;
+  string source = 3;
+  string as_of_date = 4;
+}
+
+message FxRateComponent {
+  string currency = 1;
+  string units_per_base = 2;
+}
+
+message ResolvedFxRate {
+  string source_currency = 1;
+  string target_currency = 2;
+  string rate = 3;
+  string effective_date = 4;
+  string source = 5;
+  int64 rate_set_id = 6;
+  int32 revision = 7;
+  string base_currency = 8;
+  repeated FxRateComponent components = 9;
+}
+
+message ConvertCurrencyResponse {
+  string amount = 1;
+  string currency = 2;
+  ResolvedFxRate resolved_rate = 3;
+}
+
+message ListRequiredCurrenciesRequest {}
+
+message ListRequiredCurrenciesResponse {
+  repeated string currencies = 1;
+}