consume aws-sdk@2 from npm; remove baked in file; closes #2

[spencerlepine]

Issue #, if available:

• Move aws js sdk as a seperate dependency. #2
• https://github.com/amazon-connect/amazon-connect-chatjs/security/dependabot/28

Description of changes:

consume aws-sdk@2 from npm; remove baked in file aws-sdk-connectparticipant.js

// also imports global 'AWS'
import ConnectParticipant from "aws-sdk/clients/connectparticipant"; // AWS SDK v2

this.chatClient = new ConnectParticipant({
      credentials: new AWS.Credentials('',''),
      endpoint: args.endpoint,
      region: args.region
});

NOTE

May need to upgrade to AWS SDK v3 instead. v2 may have conflict with AWS global configuration, but V3 does not have this issue (see README and Streams import notes)

const { ConnectParticipantClient } = require("@aws-sdk/client-connectparticipant"); // AWS SDK v3

const client = new ConnectParticipantClient({ region: "region" });

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