Refactor `LocalStorage` and associated hooks

[somebody1234]

Pull Request Description

• Close https://github.com/enso-org/cloud-v2/issues/1586
  • Refactor localStorage to use functionality returned by a single function, rather than registering keys plugin-style when modules are loaded.
  • This avoids errors when a module tries to read a key when the module defining the key has not yet been imported.

Important Notes

None

Testing Instructions

• Make sure local storage keys are loaded and saved as appropriate:
  • ToS and Privacy Policy modal should not reappear on reload
  • Displayed columns
  • Sidebar open state
  • Local root directory
  • Extra local root directories

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• [x] The documentation has been updated, if necessary.
• [x] Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• [x] All code follows the Scala, Java, TypeScript, and Rust style guides. In case you are using a language not listed above, follow the Rust style guide.
• [x] Unit tests have been written where possible.
• [x] ~~If meaningful changes were made to logic or tests affecting Enso Cloud integration in the libraries, or the Snowflake database integration, a run of the Extra Tests has been scheduled.~~
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

[somebody1234]

@MrFlashAccount for CR

[somebody1234]

and i guess @indiv0 (or @MrFlashAccount) for QA

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