[DNM](decimal) use new way for decimal arithmetic precision promotion

[morrySnow]

Proposed changes

Issue Number: close #xxx

1. decimalv3: use 38, min(decimalOverflowScale, ret_scale) as result precision if overflow
2. decimalv2 with largeint or bigint will promotion to decimalv3
3. decimalOverflowScale could be config by session variable

TODO:

1. update legacy planner?
2. update be code to adjust this change

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...