Mechanism to determine how many functions to upload in one request

[shiftre]

Right now we're uploading exactly 100 functions in order to be efficient and save space,
however some binaries would not include 100 functions at all, maybe 10 or 20,
while others might include 60k.

This value should be tuned and fixed, maybe a percentage or a minimum number of functions.

located in actions/match.py in perform_upload()