Add separate more granular sms metric
Add separate more granular sms metric

sms_load_counter is used in exports as well, so it is not
really what we want to track. This is what was causing the issue in
https://github.com/dimagi/commcare-hq/pull/27351

dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq