fix(echo): Use dist for Echo artifacts

[rifont]

What changed? Why was the change needed?

• The Echo SDK was published without pointing to the built artifacts, resulting in the error belo when attempting to use the SDK. This PR fixes the package.json to point to the built artifacts.
• Update readme to reflect actual SDK API
• Delete the sdk package pnpm-lock.yml, as the root pnpm-lock.yml should be used instead
• Fix pnpm v9 migration issues

Screenshots

Error when using latest @novu/sdk

> next dev --port=4000

   ▲ Next.js 14.1.0
   - Local:        http://localhost:4000
   - Environments: .env.local

 ✓ Ready in 2.8s
 ○ Compiling / ...
 ✓ Compiled / in 6.6s (5781 modules)
 ○ Compiling /api/echo ...
 ⨯ ./app/api/echo/route.ts:1:0
Module not found: Can't resolve '@novu/echo/next'
> 1 | import { serve } from "@novu/echo/next";
  2 | import { echo } from "../../echo/client";
  3 |
  4 | export const { GET, POST, PUT } = serve({ client: echo });

https://nextjs.org/docs/messages/module-not-found
 ⨯ ./app/api/echo/route.ts:1:0
Module not found: Can't resolve '@novu/echo/next'
> 1 | import { serve } from "@novu/echo/next";
  2 | import { echo } from "../../echo/client";
  3 |
  4 | export const { GET, POST, PUT } = serve({ client: echo });

https://nextjs.org/docs/messages/module-not-found
 ⨯ ./app/api/echo/route.ts:1:0
Module not found: Can't resolve '@novu/echo/next'
> 1 | import { serve } from "@novu/echo/next";
  2 | import { echo } from "../../echo/client";
  3 |
  4 | export const { GET, POST, PUT } = serve({ client: echo });

https://nextjs.org/docs/messages/module-not-found
<w> [webpack.cache.PackFileCacheStrategy] Caching failed for pack: Error: ENOENT: no such file or directory, rename '/Users/rifont/git/lightonia-app/.next/cache/webpack/client-development-fallback/0.pack.gz_' -> '/Users/rifont/git/lightonia-app/.next/cache/webpack/client-development-fallback/0.pack.gz'
<w> [webpack.cache.PackFileCacheStrategy] Caching failed for pack: Error: ENOENT: no such file or directory, rename '/Users/rifont/git/lightonia-app/.next/cache/webpack/client-development-fallback/0.pack.gz_' -> '/Users/rifont/git/lightonia-app/.next/cache/webpack/client-development-fallback/0.pack.gz'
 ✓ Compiled /_error in 948ms (3006 modules)
^C

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[rifont]

This PR is pending merging of #5598 to resolve pnpm lockfile consistency issues, by upgrading to lockfile v9.