feat: initial C++ support using standalone ANTLR scanner

[Ndugu2]

Goal
This PR introduces initial support for C/C++ cryptographic detection, resolving Issue #374.

Implementation Details

• Standalone Scanner**: Implemented a C++ sensor using standard ANTLR4 grammars (C++14), allowing for AST-based scanning without dependency on closed-source plugins.
• Detection Engine**: Added C++ specific translation and detection logic in the engine module.
• OpenSSL Rules**: Included an initial set of detection rules for the OpenSSL EVP API.
• Automated Source Generation**: Configured the antlr4-maven-plugin to generate parser classes at build-time. This PR correctly omits the massive generated Java files, keeping the repository hygiene high.

Cleanup & Hygiene

• This PR branch was cleaned to exclude unrelated C# scaffolding and binary artifacts (maven_fast/).
• Only source files and grammars are included.

Verification

• Includes OsslEvpRuleTest.java as a placeholder for architectural verification.
• To verify fully, run mvn clean install to ensure grammars compile and the module integrates correctly.

Fixes #374