remove some unnecessary/wrong [to_string] methods

[Guest0x0]

Since MoonBit allows calling impl with dot syntax now, it is no longer necessary to define to_string method wrappers to support .to_string() usage. This PR remove such unnecessary to_string wrapper methods.

One of the removed methods, Result::to_string in @result, actually has wrong behavior, forgetting to escape its arguments when necessary. This PR fixes the issue.

I also added tests for the Show impls.

[peter-jerry-ye-code-review]

‼️ This code review is generated by a bot. Please verify the content before trusting it.

Here are three potential issues or observations from the provided git diff output:

1. Removal of to_string Methods:

   • The to_string method has been removed from several implementations, such as ArrayView, Bytes, List, and Result. This could break existing code that relies on these methods for converting objects to their string representations. If these methods were intentionally removed, ensure that alternative ways to achieve the same functionality are provided or documented.

2. Inconsistent String Representation in Tests:

   • In the Show for String test, there is an inconsistency in the expected output for Show::to_string("---\"---'---\\---\n---\t---\x67---"). The test expects the output to be:

     #|---"---'---\---
     #|---	---g---
     

     However, the actual implementation might not produce this exact output, especially with escape sequences like \n and \t. Ensure that the test expectations align with the actual behavior of the to_string method.

3. Potential Redundancy in Show Implementation:

   • The Show trait implementation for Bytes and BytesView includes a method output that writes to a logger. However, the to_string method, which was removed, previously used this output method to build a string. If to_string is no longer available, ensure that the output method is sufficient for all use cases or that an alternative method for string conversion is provided.

These observations highlight potential areas where the changes might introduce issues or require additional attention to maintain functionality and consistency.

[coveralls]

Pull Request Test Coverage Report for Build 4792

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 83.126%

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Totals
Change from base Build 4784:	0.2%
Covered Lines:	4872
Relevant Lines:	5861

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💛 - Coveralls

[bobzhang]

@Guest0x0 it seems that we also need migrate from to_json method to trait method