S2 'level' 0 should be allowed

[francois-baptiste]

Describe the bug
S2 'level' 0 should be allowed

To Reproduce
Steps to reproduce the behavior:

SELECT `carto-os.carto.S2_FROMLONGLAT`(0, 0, 0);
-- Error: 'level' is not a number between 1 and 30 (but it should be)

Expected behavior

SELECT `carto-os.carto.S2_FROMLONGLAT`(0, 0, 0);
-- Returns 1

Additional context
S2 Cell Statistics