chore: support log item attributes and change visibility for item attribute

[zhu-xiaowei]

Description

1. support log items
2. change item attribute visibility and add document

General Checklist

• Added new tests to cover change, if needed
• Build succeeds using Swift Package Manager
• All unit tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (c18458c) 94.72% compared to head (ac6e18d) 94.57%.

Files	Patch %	Lines
...am/Support/Extension/JsonObject+ToJsonString.swift	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   94.72%   94.57%   -0.16%     
==========================================
  Files          35       35              
  Lines        1935     1934       -1     
==========================================
- Hits         1833     1829       -4     
- Misses        102      105       +3     

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