Calibrate gas and set gas limit

[qdrn]

The number of autonomous SCs that are allowed to run is probably too big. Execution of SCs is lagging behind (see log below). We need to set a proper limit.

✔️ command · get_filtered_sc_output_event

Context: Slot: (period: 57815, thread: 18) at index: 1
On chain execution
Call stack: A1KfeDzWbNp6kEaXHgHjMzzWBMXeLjLdvcdwZBB4VaDMHs3aCwP,A1KfeDzWbNp6kEaXHgHjMzzWBMXeLjLdvcdwZBB4VaDMHs3aCwP

✔️ command · get_status

Last slot: (period: 67020, thread: 24)

[qdrn]

Maybe related #2810

[AurelienFT]

Issue to do it is here https://github.com/massalabs/massa-sc-runtime/issues/158