An API to provide source file and line/column information for selected function, variable, reference.

[XVilka]

Currently Rizin can show the source filename and line/column information when debug information is available e.g. in DWARF or PDB formats. But there is no way to get that information via the API if Rizin is used as a library. It will be quite beneficial for all users of the Rizin API, including Cutter.

It could get such information, e.g. in char * format for these:

• RzAnalysisFunction - at the point of function definition in source file
• RzAnalysisVar - at the point of variable definition in source file
• RzAnalysisVarGlobal - at the point of global definition
• For all references of those (X-Refs) at the point of use

Depends on #907