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Refactor Storage Slot Usage in Contracts (#979)

This pull request introduces new top-level constants `SafeStorage`
library to centralize and standardize the management of storage slot
constants across multiple contracts.

Why:
To prevent copy-paste, examples would be:
- Our own `HandlerContext` contract changed in the PR
- [guardrail
contract](https://github.com/safe-research/guardrail/blob/13d978060/src/Guardrail.sol#L27)

This change reduces gas costs by inlining constants in assembly where
they previously were not.

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Co-authored-by: Nicholas Rodrigues Lordello <nick@safe.global>

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