Added throws in Property initialization

[o-nnerb]

Description

The Pull Request (PR) proposed based on the feature proposal in issue #15 aims to implement a new feature that allows the execution of asynchronous commands that may generate errors during property initialization.

The PR includes an update to the Property protocol declaration, which now allows the throws keyword in the makeProperty function. This means that developers can now execute code that may generate errors during property initialization.

The PR also includes some updates to the syntax of asynchronous codes that may also generate errors, so that they follow the same syntax as property initialization. This standardization helps make the code more consistent and easy to understand.

With this new feature, developers now have the option to execute code that generates errors during property initialization, improving code robustness and making error debugging easier. This PR has passed unit tests to ensure that the new feature is working correctly.

Fixes #15

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.