features (local storage draft): useLocalStorageDraft hook (#191)

- normalizeDraftKey -> adds the defined suffix to the draft key
- denormalizeDraftKey -> strips the added suffix from draft key when need
- useLocalStorageDraft -> main hook
- useFormDraft -> form adaptation of the main hook
- getDraftStorageStats -> storage statistics
- cleanupOldDrafts -> clean up old drafts

Author: ccanokwuru