Feat(draft chat input): Store input in browser storage

[DorraJaouad]

☑️ Resolves

• Fix #3055

• Reduced the changes between chat input and test of NewMessage.

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

No visual changes.

🚧 Tasks

• [ ] Code review

🏁 Checklist

• [ ] 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• [ ] 🖌️ Design was reviewed, approved or inspired by the design team
• [ ] ⛑️ Tests are included or not possible
• [ ] 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required