feat: add char and Character mutator

[oetr]

We forgot about chars in the past!

Not sure if @Positive and @Negative , etc. make sense on chars (the only signed integral in Java? 😆)
@InRange can be used like in the sample fuzz test.

fuzzerTestOneInput(@InRange(min = '\u0000', max = '\uFFFF') char data) {

[Copilot]

Pull request overview

This PR adds support for char and Character types to the mutation framework, which was previously missing support for Java's character primitive type.

Key changes:

• Implemented char/Character mutator in IntegralMutatorFactory
• Added @InRange annotation support for character types
• Created test coverage for the new character mutator functionality

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/main/java/com/code_intelligence/jazzer/mutation/mutator/lang/IntegralMutatorFactory.java	Adds character mutator implementation and updates AbstractIntegralMutator to support non-Number types
src/main/java/com/code_intelligence/jazzer/mutation/annotation/InRange.java	Extends @InRange annotation to support char and Character types
src/test/java/com/code_intelligence/jazzer/mutation/mutator/StressTest.java	Adds stress test case for character mutator
tests/src/test/java/com/example/CharFuzzer.java	Adds example fuzzer demonstrating character mutation with @InRange
tests/BUILD.bazel	Adds build configuration for the new CharFuzzer test
docs/mutation-framework.md	Updates documentation to include char and Character in @InRange annotation

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