Create pub constant Decimal::MAX_SCALE #1062

Job	Run time
Check file formatting and style	58s
Check documentation	56s
Fuzz Tests	1m 14s
Dependency Tests (stable)	3m 12s
Check minimum rust version	1m 5s
Dependency Tests (beta)	3m 10s
Database Tests - MySQL (stable)	1m 10s
Database Tests - PostgreSQL (stable)	2m 48s
Database Tests - MySQL (beta)	1m 20s
Database Tests - PostgreSQL (beta)	2m 49s
Standard Tests (stable)	2m 29s
Standard Tests (beta)	2m 25s
Database Tests	1s
Test	1s
Pass	1s
	23m 39s

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