chore(deps): replace libiconv (LGPL-2.1) with simdutf (MIT/Apache-2.0) #641

Job	Run time
Integration Tests (Ubuntu) (Debug)	3m 15s
Integration Tests (Ubuntu) (Release)	3m 54s
Integration Test Coverage	4m 5s
Integration Tests (Windows) (Release)	4m 9s
Integration Tests (macOS) (Debug)	1m 56s
Performance Benchmarks	3m 39s
Integration Tests (Windows) (Debug)	3m 9s
Integration Tests (macOS) (Release)	1m 39s
	25m 46s

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