Import `FoundationEssentials` in `NIOFoundationCompat` #383

Job	Run time
Integration Tests / Linux (5.8)	12m 43s
Integration Tests / Linux (5.9)	14m 32s
Integration Tests / Linux (5.10)	14m 6s
Integration Tests / Linux (nightly-6.0)	13m 25s
Integration Tests / Linux (nightly-main)	13m 54s
Benchmarks / Benchmarks / Linux (5.8)	3m 0s
Benchmarks / Benchmarks / Linux (5.9)	5m 10s
Benchmarks / Benchmarks / Linux (5.10)	4m 49s
Benchmarks / Benchmarks / Linux (nightly-6.0)	5m 55s
Benchmarks / Benchmarks / Linux (nightly-main)	6m 5s
Soundness / API breakage check	2m 13s
Soundness / Documentation check	2m 1s
Soundness / License headers check	11s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	3s
Soundness / Format check	52s
Soundness / Shell check	8s
Swift 6 Language Mode / Swift 6 language mode	44s
Cxx interop / Cxx interop / Linux (5.8)	1m 7s
Cxx interop / Cxx interop / Linux (5.9)	1m 16s
Cxx interop / Cxx interop / Linux (5.10)	1m 9s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 51s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 43s
Unit tests / Unit tests / Linux (5.8)	3m 12s
Unit tests / Unit tests / Linux (5.9)	3m 13s
Unit tests / Unit tests / Linux (5.10)	3m 13s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 37s
Unit tests / Unit tests / Linux (nightly-main)	1m 42s
	1h 59m 57s

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