Add GET /internal/files. (#4295) #73

Job	Run time
test-unix-nightly (macos, 3.11, 12.1, nightly)	3m 15s
test-win-nightly (windows, 3.9, 12.1, nightly)	2m 22s
test-unix-nightly (linux, 3.11, 12.1, nightly)	3m 14s
test-stable (macos, 3.9, 12.1, stable)	3m 6s
test-win-nightly (windows, 3.10, 12.1, nightly)	2m 23s
test-stable (macos, 3.10, 12.1, stable)	3m 5s
test-win-nightly (windows, 3.11, 12.1, nightly)	2m 21s
test-stable (macos, 3.11, 12.1, stable)	3m 13s
test-win-nightly (windows, 3.12, 12.1, nightly)	2m 21s
test-stable (macos, 3.12, 12.1, stable)	3m 7s
test-stable (linux, 3.9, 12.1, stable)	3m 25s
test-stable (linux, 3.10, 12.1, stable)	3m 22s
test-stable (linux, 3.11, 12.1, stable)	3m 26s
test-stable (linux, 3.12, 12.1, stable)	3m 23s
test-stable (windows, 3.9, 12.1, stable)	2m 3s
test-stable (windows, 3.10, 12.1, stable)	2m 13s
test-stable (windows, 3.11, 12.1, stable)	2m 5s
test-stable (windows, 3.12, 12.1, stable)	2m 8s
	50m 32s

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