[Fuzzing] Add Jazzer-based fuzzing suite with 145x coverage increase

[vishalcoc44]

Introducing a fuzzing suite, we replace the legacy integration with a better master fuzzer,
and a native Gradle-based execution profile.

Coverage increased :

• Increased code coverage from the baseline 0.18% to ~26.1% (a 145x increase).
• Reached 6,008+ exploration points across the library's core parsing and serialization paths.

Bug Discovery: Identified a persistent java.lang.AssertionError in IonReaderTextRawTokensX.skipOverRadix during text parsing.
Details :

1. Master Fuzzer (IonAllFeaturesFuzzer)
   This fuzzer alternates between strategies dynamically to have more reach--

Recursive Parsing: Deep exploration of nested Lists, Sexps, and Structs.
Round-Trip Validation: Ensures consistency when converting between Binary and Text formats.
DOM Mutation: Fuzzes the IonValue hierarchy through random injections, clones, and removals.

2. Build Integration
   Added a native -Pfuzz profile to build.gradle.kts.
   Isolated dependencies (Jazzer, JUnit5) to ensure zero impact on standard production builds.
   Enabled seamless local execution for developers.