Create workspace

[Shreyas281299]

Completes -SPARK-559074

My suggestion on how to review this PR - close the packages folder, it only has file name changes. After that its a small PR

This PR is the second PR in the series of many PRs to create react-widgets a yarn workspace
First PR #1438

This PR completes the final 4tasks in the list below

Tasks required to make react-widgets a yarn workspace

• Move components out of node_modules
• Adjust the tooling to use the new paths
• Enable yarn workspace in react-widget
• Add dependencies inside each package
• Add scripts for each package
• Fix tooling to use yarn workspaces packages

Checks

• Build is passing
• UTs are passing
• Integration tests are passing

Testing

• Ran yarn build:all
• Ran yarn workspace @webex/ build:src
• Ran yarn workspace @webex/ serve
• Served all the demos
• Ran all UTs

Issues found

All these errors are persistent in master and node-upgrade branch also

• People list has ENOENT
 error while building - any css file thats why this error - its doesnt affect anything

• Widget-meet has ENOENT - any css file thats why this error - its doesnt affect anything

• All demo components fails the buildES function.
• Issue with tsconfig- webpack build fails for all ts 'widget' components
• Failling command
- npm run deploy is failing in master and node-upgrade as well
• We are ignoring all the src files for eslint tests
• journey tests are failling in the node-upgrade branch as well

[Shreyas281299]

Why this change is required?