feat!: Add `apiKey` support to API requests #515

Job	Run time
build-docs-pr	3m 37s
prepare-test-reports (17)	8m 13s
prepare-test-reports (21)	10m 53s
prepare-test-reports (25)	9m 18s
jvm-build-test-docling-serve-api-java21	1m 29s
jvm-build-test-docling-version-tests-java17	3m 4s
jvm-build-test-docling-version-tests-java21	2m 49s
jvm-build-test-docling-version-tests-java25	4m 7s
jvm-build-test-docling-serve-client-java25	6m 42s
jvm-build-test-docling-serve-client-java21	6m 10s
jvm-build-test-docling-testcontainers-java25	6m 54s
jvm-build-test-docling-serve-client-java17	6m 12s
jvm-build-test-docling-testcontainers-java17	7m 18s
jvm-build-test-docling-testcontainers-java21	6m 34s
jvm-build-test-docling-serve-api-java17	1m 49s
jvm-build-test-docling-serve-api-java25	2m 45s
save-pr-info	4s
	1h 27m 58s

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