Period stats component

[bobo-k2]

Pull Request Summary

NOTE: stake amount and dApp earner data is only available for Shibuya at the moment.

• Created component to display dApp staking period statistics.
• Added support for api.at in BaseApi class.
• Small refactoring

Styling to be done

Check list

• [ ] contains breaking changes
• [x] adds new feature
• [ ] modifies existing feature (bug fix or improvements)
• [ ] relies on other tasks
• [ ] documentation changes
• [ ] tested on mobile devices

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit f91e9c6):

https://astar-apps--pr1306-feat-period-stats-lxqag71q.web.app

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