Cherry-pick "LibTextCodec: Implement legacy encoders" #2741

Job	Run time
Lagom (Linux, ubuntu-22.04, FUZZ) / CI	8m 49s
Lagom (macOS, macos-14, NO_FUZZ) / CI	43m 0s
Lagom (Linux, ubuntu-22.04, NO_FUZZ) / CI	1h 10m 5s
SerenityOS (GNU, ubuntu-22.04, aarch64, NORMAL_DEBUG) / CI	12m 26s
SerenityOS (GNU, ubuntu-22.04, riscv64, NORMAL_DEBUG) / CI	14m 57s
SerenityOS (GNU, ubuntu-22.04, x86_64, ALL_DEBUG) / CI	1h 32m 31s
SerenityOS (Clang, ubuntu-22.04, x86_64, NORMAL_DEBUG) / CI	17m 40s
SerenityOS (GNU, ubuntu-22.04, x86_64, NORMAL_DEBUG) / CI	11m 8s
	4h 30m 36s

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