feat: chat context pills

[sharanyavinod]

• Introduces pills to display context to be sent along with chat messages
• Current scope includes only simple elements, attachments to follow -> mentioned in the doc
• Similarly, collapsing pills to be handled once mocks are available. Currently all pills are displayed as is with scroll - mentioned in doc

Preview: https://da.live/canvas?nx=ew-pill&nxver=2#/exp-workspace/frescopa/index

To test: run the following in your browser console:

document.dispatchEvent(new CustomEvent('nx-add-to-chat', {
  detail: { id: 'test', label: 'Some selection' }
}));

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