Add Vault class

[danroc]

This PR adds a Vault class that will be used in the vault refactor.

The end goal of the refactor is to move the encryption logic out of the KeyringController into a separate class. This is the first step in this direction.

This PR doesn't modify the KeyringController, it will be done after the controller is migrated to the BaseControllerV2.

Closes#208

[socket-security]

New dependency changes detected. Learn more about Socket for GitHub ↗︎

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👍 No new dependency issues detected in pull request

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Pull request alert summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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📊 Modified Dependency Overview:

➕ Added Package	Capability Access	+/- Transitive Count	Publisher
@types/uuid@9.0.1	None	+0	types
ajv-formats@2.1.1	None	+6	esp
uuid@9.0.0	None	+0	ctavan
ajv@8.12.0	eval	+5	esp

[legobeat]

Does this break node14? In either case: Separate change.

[legobeat]

Suggested change

	*Ifastateisgiven,thevaultwillberestoredformit,otherwise,anew
	*vaultwillbecreated.
	*Ifastateissupplied,theoriginatingvaultwillberestored.
	*Otherwise,anewvaultwillbeinitialized.