Add GA appearance/EIP-3770 tracking

[iamacook]

What it solves

Appearance setting tracking.

How this PR fixes it

When a user opens the appearance setting tab a GA tracking event is dispatched. A dynamic (enable/disable) event is dispatched when a user changes their EIP-3770 prefix preferences.

How to test it

1. Open the appearance settings pane and note the GA event.
2. Change the prefix preference and note the matching GA event.

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[coveralls]

Pull Request Test Coverage Report for Build 1578177176

• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.02%) to 32.231%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/routes/safe/components/Settings/Appearance/index.tsx	0	6	0.0%

Totals
Change from base Build 1577488613:	-0.02%
Covered Lines:	3088
Relevant Lines:	8506

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💛 - Coveralls

[github-actions]

Deployment links

🟠 Safe Rinkeby	⚪ Safe Mainnet	🟣 Safe Polygon	🟡 Safe BSC	⚫ Safe Arbitrum	🟢 Safe xDai

[github-actions]

E2E Tests Failed
Check the results here: https://github.com/gnosis/safe-react-e2e-tests/actions/runs/1578233246

Failed tests:

• ❌ Address book Address book
• ❌ Safe Apps List Safe Apps List

[katspaugh]

Nice!

[francovenica]

The event is there.

Note: I can only check in the console since GA is actually not being tracked in PR's. I'll re check in prod