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

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📊 Modified Dependency Overview:

➕ Added Package	Capability Access	+/- Transitive Count	Publisher
@types/[email protected]	None	+0	types
[email protected]	None	+6	esp
[email protected]	None	+0	ctavan
[email protected]	eval	+5	esp