Create pub constant Decimal::MAX_SCALE #1060

Job	Run time
Fuzz Tests	1m 8s
Check documentation	57s
Check file formatting and style	1m 12s
Dependency Tests (stable)	3m 14s
Dependency Tests (beta)	3m 12s
Check minimum rust version	1m 9s
Database Tests - MySQL (stable)	1m 11s
Database Tests - PostgreSQL (stable)	2m 52s
Database Tests - MySQL (beta)	1m 13s
Database Tests - PostgreSQL (beta)	2m 44s
Standard Tests (stable)	2m 19s
Standard Tests (beta)	2m 32s
Database Tests	1s
Test	0s
Pass	0s
	23m 44s

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