feat: added includes; added excludes date background

[qdechochen]

📑 Summary

feat:
added: includes
added: rect background for exclude dates

📏 Design Decisions

includes: similar as exclude, but only support date. includes would override exclude if set a same date. eg.
`
excludes weekends, 2021-10-01,2021-10-04,2021-10-05,2021-10-06,2021-10-07

includes 2021-10-09
`

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added unit/e2e tests (if appropriate)
• 🔖 targeted develop branch

[ashishjain0512]

Thanks for your contribution, This sure is a nifty feature.