light-client-wasm: support using JS object as configuration #622

Job	Run time
Checks / Clippy	7m 51s
Checks / Format	14s
Tests / Build & Test (Wasm)	5m 43s
Tests / Build & Test (macos-latest)	9m 50s
Tests / Build & Test (windows-2022)	17m 3s
Tests / Build & Test (ubuntu-latest)	13m 14s
Code Coverage (ubuntu-latest)	11m 43s
	1h 5m 38s

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