core/analysis: remove globals

[XVilka]

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 documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

It's not the most beautiful and right way to do it, but the RzAnalysisEsil structure/context is so cursed already and will eventually be removed during the ESIL->RzIL migration that there is no reason to spend too much time on this.

Test plan

CI is green

Closing issues

Partially address #4055