[On-chain] Vault liquidations

[jblewnormal]

Objective

Add functionality regarding the liquidation of under-collateralized Vaults.

Origin Document

This is needed to ensure synthetic assets always remain at least 1:1 collateralized.

Goals

• Protect synthetic asset token holders from devaluation
• Decentralize the Normal Protocol with the inclusion of Keepers to execute liquidations

Deliverables

• Vault-specific and macro liquidation config properties
• Enter liquidation (by Keeper)
• Vault status management/limitation based on if in liquidation or not

Non-goals / Non-deliverables

• Tests
• Docs

General deliverables

• Comments: Add/update TODOs and comments alongside the source code so it is easier to follow.
• Testing: Add new tests (unit and/or E2E) to the test suite.
• Documentation: Update architectural or development READMEs; use mermaid diagrams where appropriate.

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Creator: [@jblewnormal ]