refactor: add provider barrels and webhook grouping

src/providers/provider.types.ts

@@ -0,0 +1 @@
+export type Provider = "twilio" | "web";

src/providers/twilio/index.ts

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+export { sendTypingIndicator } from "../../twilio/typing.js";
+export { createClient } from "../../twilio/client.js";
+export { monitorTwilio } from "../../twilio/monitor.js";
+export { sendMessage, waitForFinalStatus } from "../../twilio/send.js";
+export { listRecentMessages, formatMessageLine } from "../../twilio/messages.js";
+export {
+	updateWebhook,
+	findIncomingNumberSid,
+	findMessagingServiceSid,
+	setMessagingServiceWebhook,
+} from "../../twilio/update-webhook.js";
+export { findWhatsappSenderSid } from "../../twilio/senders.js";
+export { formatTwilioError, logTwilioSendError } from "../../twilio/utils.js";

src/providers/web/index.ts

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+export {
+	createWaSocket,
+	waitForWaConnection,
+	sendMessageWeb,
+	loginWeb,
+	monitorWebInbox,
+	monitorWebProvider,
+	webAuthExists,
+	logWebSelfId,
+	pickProvider,
+	WA_WEB_AUTH_DIR,
+} from "../../provider-web.js";