Add lightweight wasm support to `rust-decimal` #1018

Job	Run time
Standard Tests (stable)	37s
Standard Tests (beta)	34s
Check file formatting and style	1m 15s
Check documentation	1m 8s
Standard Tests (stable / wasm)	50s
Dependency Tests (stable)	1m 42s
Standard Tests (beta / wasm)	47s
Dependency Tests (beta)	1m 59s
Fuzz Tests	1m 16s
Check minimum rust version	46s
Dependency Tests (stable / wasm)	1m 55s
Dependency Tests (beta / wasm)	1m 43s
Database Tests - PostgreSQL (stable)	3m 22s
Database Tests - PostgreSQL (beta)	3m 28s
Database Tests - MySQL (stable)	1m 54s
Database Tests - MySQL (beta)	1m 52s
Database Tests	1s
Test	0s
Pass	0s
	25m 9s

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