feat(Ads): add AdsStore

[Gio2018]

Summary

• Include short description of what this PR accomplishes

References

• Links to docs, tickets, designs if available

Implementation Details

• Overview of work that was implemented and changes made to the codebase

Test Steps

• Write out what QA should do to verify this change works as expected and hasn't introduced regressions. Can mention specific OS versions, devices, areas of the app to test as needed.

PR Checklist:

• Added Unit / UI tests
• Self Review (review, clean up, documentation, run tests)
• Basic Self QA

Screenshots

[pocket-ci]

	Messages
📖	No SwiftLint violations! 🎉
📖	Project coverage: 36.69%
📖	Checking XCode Environment Variables
📖	Edited 2 files
📖	Created 2 files

PocketKit: Coverage: 60.88

File	Coverage
HomeViewModel.swift	64.67%	✅
AdsStore.swift	24.14%	⚠️
HomeViewController.swift	61.35%	✅
AdCarouselCellConfiguration.swift	92.68%	✅

PocketKitTests: Coverage: 28.46

File	Coverage
HomeViewModel.swift	42.39%	⚠️
AdsStore.swift	24.14%	⚠️
HomeViewController.swift	46.51%	⚠️
AdCarouselCellConfiguration.swift	0.0%	⚠️

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