* Add logic to handle 3-digit and 4-digit numbers
* Check if the number is 3 digits with the first digit between 0-9 and the last two digits between 00-60
* Check if the number is 4 digits with the first two digits between 00-24 and the last two digits between 00-59
* Convert the number into a time expression in the format 'HH:MM' if conditions are met
* **TimeExpression.swift**
- Change the validation for 3-digit numbers to allow last two digits between 00-59.
- Change the validation for 4-digit numbers to allow first two digits between 00-24 and last two digits between 00-59.
* **TimeExpressionTests.swift**
- Update test cases to reflect the new validation rules.
- Change test input "1360" to "2440" and update expected results accordingly.
- Update assertions for the modified test cases.
* **Test cases**
- Create `KanaKanjiConverter` instance
- Use `makeDirectInput` to create `ComposingText` instances for test cases
- Call `convertToTimeExpression` function with different inputs
- Verify the results using `XCTAssertEqual` and `XCTAssertTrue`
* **Helper function**
- Add `makeDirectInput(direct input: String) -> ComposingText` helper function
* **Concurrency**
- Use `await` for the call of `convertToTimeExpression`
- Call `convertToTimeExpression` outside of XCTest function
* **testConvertToTimeExpression**
- Change function signature to `async throws`
- Initialize `KanaKanjiConverter` with `await`
* **testToTimeExpressionCandidates**
- Change function signature to `async throws`
- Initialize `KanaKanjiConverter` with `await`
* Rename `toTimeExpressionCandidates` function to `convertToTimeExpression`
* Remove `toTimeExpressionCandidates` function and integrate its logic into `convertToTimeExpression`
* Call `convertToTimeExpression` function in `getWiseCandidate` function
Fixes#170
Add functionality to convert 3-digit and 4-digit numbers into time expressions in the format 'HH:MM'.
* Add `convertToTimeExpression` function in `Sources/KanaKanjiConverterModule/Converter/TimeExpression.swift` to handle the conversion.
* Modify `Sources/KanaKanjiConverterModule/Converter/KanaKanjiConverter.swift` to include the new function and call it within `getWiseCandidate`.
* Add tests in `Tests/KanaKanjiConverterModuleTests/ConverterTests/TimeExpressionTests.swift` to ensure the new function works correctly.
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