fix: rename sync to sink

[markveerman]

Issue #, if available: n/a

Notes

In this context, a sink is the destination of a data flow (S3, Kinesis, etc.) so sync is incorrect and may cause confusion.

Checklist

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	91.35%	665/728
🔴	Branches	58.14%	100/172
🟢	Functions	98.25%	56/57
🟢	Lines	91.35%	665/728

Test suite run success

30 tests passing in 16 suites.

Report generated by 🧪jest coverage report action from 40fbd7e

[drduhe]

LGTM