Annotation for local variables

[NirmalManoj]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the documentation and the radare2 book with the relevant information (if needed)

Detailed description
This PR adds annotation for local variables and function parameters. The data we have for each variable is the location of the variable in the code and the name of the variable. This will suffice for implementing retype local variables action in the decompiler widget in Cutter.

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Test plan

1. Compile this PR.
2. Fetch PR #128 from r2ghidra-dec and compile it.
3. Follow the test plan in the PR linked in step 2.
4. Check code.

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Closing issues

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[XVilka]

Please add a test.

[NirmalManoj]

@XVilka This is a PR to the decompiler-refactoring branch. We have to add tests for all the new types of annotations

R_CODE_ANNOTATION_TYPE_FUNCTION_NAME,
R_CODE_ANNOTATION_TYPE_GLOBAL_VARIABLE,
R_CODE_ANNOTATION_TYPE_CONSTANT_VARIABLE,
R_CODE_ANNOTATION_TYPE_LOCAL_VARIABLE,
R_CODE_ANNOTATION_TYPE_FUNCTION_PARAMETER,

I will do it in a PR later which will implement unit tests for all of these. I want to get this merged as soon as possible so that the CI will work in r2ghidra-dec PRs and in Cutter PRs.