Eliminate javadoc warnings

[dsgrieve]

Motivation and Context

Prepare javadoc for Microsoft learn API browser

Description

Eliminated javadoc warnings with the exception of warning: use of default constructor, which does not provide a comment. This warning would require adding a default constructor to the classes where the warning is raised. It is my opinion that this would not add value to the code base or to the javadoc.

This affects only the semantickernel-api, aiservices, and semantickernel-experimental modules. These are the only modules where the javadoc is API facing.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄