feat(cpp): add ANTLR grammar files for C/C++ support

[Divyateja2709]

hi @n1ckl0sk0rtge

This PR adds the initial ANTLR grammar infrastructure required for C/C++ language support in the Sonar Cryptography Plugin.

Changes Included
Added CLexer.g4 for C/C++ lexical analysis
Added CParser.g4 for parsing C/C++ source files
Updated SonarQube plugin configuration to recognize:
.c
.cpp
.h
source files through requiredForLanguages
Purpose

These grammar files provide the parsing foundation required for upcoming:

C/C++ AST generation
OpenSSL detection rules
C/C++ detection engine integration

[san-zrl]

Hi @Divyateja2709,

Thank you for your PR and for the time and effort you put into contributing to CBOMkit—we truly appreciate your interest.

You may have noticed that we are already working on adding C/C++ support to sonar-cryptography in PR #377. This approach differs from yours, as it relies on Sonar’s native C/C++ support package rather than ANTLR, similar to how the existing Java module is implemented.

Work on PR #377 is already quite advanced, and at this stage we are leaning toward this approach because we expect it to provide stronger support for cross-file symbol tracing through the Sonar infrastructure.

That said, we will keep your PR open for now until a final decision is made.