[Refactor] Introduce TranslatorContext (1/2) #92

Job	Run time
Compatibility test	4m 50s
Swift 6 Language Mode	0s
Integration test / Linux (5.8)	22s
Example packages / Linux (5.8)	21s
Integration test / Linux (5.9)	1m 31s
Example packages / Linux (5.9)	15m 46s
Integration test / Linux (5.10)	1m 32s
Example packages / Linux (5.10)	15m 4s
Integration test / Linux (nightly-6.0)	2m 3s
Integration test / Linux (nightly-main)	29s
Example packages / Linux (nightly-6.0)	22m 18s
Soundness / API breakage check	2m 41s
Example packages / Linux (nightly-main)	26s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	1m 39s
Soundness / Format check	35s
Soundness / License headers check	6s
Soundness / Unacceptable language check	2s
Soundness / Shell check	30s
Unit tests / Unit tests / Linux (5.8)	22s
Unit tests / Unit tests / Linux (5.9)	1m 40s
Unit tests / Unit tests / Linux (5.10)	1m 38s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 59s
Unit tests / Unit tests / Linux (nightly-main)	27s
	1h 16m 24s

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