Refactor profiling module

Description

Make the use of local profile_t objects unnecessary by storing all of them in a hashmap in the profiling module. Change the routines profiling_in and profiling_out to use a string as argument and retrieve the corresponding profile_t object from the hashmap. This simplifies the code and also makes it easier to see which profiling region is closed.

Also, add new macros PUSH_SUB_WITH_PROFILE and POP_SUB_WITH_PROFILE: they combine the PUSH/POP_SUB macros with profiling_in/profiling_out calls using the same name. This makes it possible to save some lines.

News snippet

Refactor profiling module

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.