[SUMMARY] MAPDL features/bugs implementation list

[germa89]

This issues is to keep track of the features/bugs that needs to be fixed in MAPDL. They might be tracked somewhere else as well, but this issue should raise visibility among PyMAPDL users.

• Release port before exiting Very variable time for launch_mapdl() #2564
• Adding variable retrieval Add mapdl.variables for variables. #2021
• Transferring arrays
  - API method to transfer arrays to the MAPDL instance #1038
  - Array parameters retrieval fail when the size is very big #2844
• Attach a session ID in each gRPC message. See Performance decline during loops after update to newer version of apdl-mapdl-core #2608