Add lightweight wasm support to `rust-decimal` #1019

Job	Run time
Check minimum rust version	32s
Check documentation	1m 2s
Check file formatting and style	1m 10s
Dependency Tests (stable)	2m 15s
Fuzz Tests	1m 14s
Dependency Tests (beta)	2m 12s
Database Tests - MySQL (stable)	2m 6s
Dependency Tests (stable / wasm)	2m 16s
Database Tests - PostgreSQL (stable)	3m 36s
Database Tests - MySQL (beta)	1m 50s
Dependency Tests (beta / wasm)	2m 24s
Database Tests - PostgreSQL (beta)	3m 16s
Standard Tests (stable)	2m 17s
Standard Tests (beta)	2m 20s
Standard Tests (stable / wasm)	2m 21s
Standard Tests (beta / wasm)	2m 12s
Database Tests	1s
Test	0s
Pass	0s
	33m 4s

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