Setup basic Alpaca action fetch and test.

src/alpaca/exchange.ts

@@ -1,6 +1,7 @@
 import Alpaca from '@alpacahq/alpaca-trade-api';
 import { AlpacaPortfolioProvider } from './portfolio';
 import { AlpacaQuoteProvider } from './quote';
+import { AlpacaActionProvider } from './actions';
 import { Exchange } from '../interface/exchange';
 import { PortfolioProvider } from '../interface/portfolio';
 import { QuoteProvider } from '../interface/quote';
@@ -51,7 +52,7 @@ export class AlpacaExchange implements Exchange {
 
         this.portfolioProvider = new AlpacaPortfolioProvider(this.alpaca);
         this.quoteProvider = new AlpacaQuoteProvider(this.alpaca);
-        this.actionProvider = null!;
+        this.actionProvider = new AlpacaActionProvider(this.alpaca);
 
         this.name = 'Alpaca';
     }