Add Date shortcut ISO 8601 format as an option in preference

[ZeroX-DG]

Take over from https://github.com/BoostIO/Boostnote/pull/3094. Thanks @lockee14

Description

Feature: https://github.com/BoostIO/Boostnote/issues/3064 Add an option in preference > interface to toggle the iso 8601 format for the Date shortcut using ctrl-/ and ctrl-shift-/

Issue fixed

Type of changes

• :white_circle: Bug fix (Change that fixed an issue)
• :white_circle: Breaking change (Change that can cause existing functionality to change)
• :white_circle: Improvement (Change that improves the code. Maybe performance or development improvement)
• :radio_button: Feature (Change that adds new functionality)
• :white_circle: Documentation change (Change that modifies documentation. Maybe typo fixes)

Checklist:

• :radio_button: My code follows the project code style
• :white_circle: I have written test for my code and it has been tested
• :white_circle: All existing tests have been passed
• :radio_button: I have attached a screenshot/video to visualize my change if possible

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IssueHunt Summary

### Referenced issues This pull request has been submitted to: - [#3064: Insert Date ISO 8601 Style](https://issuehunt.io/repos/53266139/issues/3064) ---