Remove unused code from azure-json and azure-xml

[alzimmermsft]

Description

Removes dead code from azure-json and azure-xml. Additionally modifies code to remove needless types, such as the merging of serialization types from having deep hierarchies to flattened hierarchies as the code is implementation.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR removes dead code from azure-json and azure-xml modules, primarily eliminating unused classes and simplifying type hierarchies by flattening deep inheritance structures.

Key changes:

• Removes unused classes including versioning utilities, delegate patterns, and duplicate detection functionality
• Simplifies type hierarchies by eliminating intermediate base classes (e.g., JsonGeneratorImpl, JsonParserBase)
• Removes support for various JSON parsing features that were not being used (single quotes, unquoted field names, trailing commas, etc.)
• Inlines constants and removes unnecessary abstraction layers

Reviewed changes

Copilot reviewed 89 out of 132 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ByteBasedPNameFactory.java	Removes unused DO_INTERN flag and changes return type from ByteBasedPName to PName
ByteBasedPName.java	Entire class removed (unused intermediate base class)
IoStreamException.java	Entire class removed (unused exception wrapper)
ErrorConsts.java	Inlines tokenTypeDesc method instead of delegating to external utility
CommonConfig.java	Moves property constants from external class to inline definitions
WFCException.java	Entire class removed (unused exception type)
spotbugs-exclude.xml	Updates class names to match refactored code
VersionUtil.java	Entire class removed (unused versioning utility)
TextBuffer.java	Removes unused factory method and several content conversion methods
RequestPayload.java	Entire class removed (unused payload container)
JsonParserSequence.java	Entire class removed (unused parser composition utility)
JsonParserDelegate.java	Entire class removed (unused delegation pattern)
JsonGeneratorDelegate.java	Entire class removed (unused delegation pattern)
JacksonFeatureSet.java	Entire class removed (unused feature management)
JacksonFeature.java	Entire class removed (unused feature interface)
BufferRecyclers.java	Removes deprecated legacy methods
BufferRecycler.java	Removes unused base64 codec buffer constant
package-info.java	Entire file removed (various packages)
WritableTypeId.java	Entire class removed (unused type ID handling)
TypeReference.java	Entire class removed (unused generic type handling)
ResolvedType.java	Entire class removed (unused type abstraction)
Name.java	Entire class removed (unused name abstraction)
CharsToNameCanonicalizer.java	Removes flags parameter and simplifies construction
ByteQuadsCanonicalizer.java	Removes flags parameter and hardcodes intern/overflow settings
WriterBasedJsonGenerator.java	Flattens hierarchy by extending JsonGenerator directly, removes unused write methods
UTF8StreamJsonParser.java	Flattens hierarchy by extending JsonParser directly, removes unused features
UTF8JsonGenerator.java	Flattens hierarchy by extending JsonGenerator directly, removes configuration complexity
ReaderBasedJsonParser.java	Flattens hierarchy by extending JsonParser directly, removes unused features
PackageVersion.java.in	Entire file removed (template no longer needed)
PackageVersion.java	Entire class removed (versioning no longer needed)
JsonWriteFeature.java	Removes unused feature enum values and simplifies to single feature
JsonWriteContext.java	Removes duplicate detection support and DupDetector integration
JsonReadFeature.java	Removes most feature enum values, keeps only essential ones
JsonReadContext.java	Removes duplicate detection and current value tracking
JsonParserBase.java	Entire class removed (intermediate base class no longer needed)
JsonGeneratorImpl.java	Entire class removed (intermediate base class no longer needed)
DupDetector.java	Entire class removed (duplicate detection not used)
ByteSourceJsonBootstrapper.java	Simplifies parser construction by removing codec and flags parameters
SegmentedStringWriter.java	Entire class removed (unused writer implementation)
OutputDecorator.java	Entire class removed (unused decorator pattern)
NumberOutput.java	Simplifies notFinite methods to use Java 8+ isFinite methods