feat: Support responses with multiple media types in `content` #2945

Job	Run time
test_min_deps (macos-latest)	42s
Integration Tests (pdm.lock)	35s
test_min_deps (windows-latest)	38s
Integration Tests (pdm.minimal.lock)	26s
test_min_deps (ubuntu-latest)	36s
test (3.9, macos-latest)	17s
test (3.9, ubuntu-latest)	17s
test (3.10, ubuntu-latest)	18s
test (3.10, macos-latest)	16s
test (3.11, macos-latest)	1s
test (3.9, windows-latest)	17s
test (3.11, ubuntu-latest)	15s
test (3.12, ubuntu-latest)	18s
test (3.10, windows-latest)	18s
test (3.13, macos-latest)	17s
test (3.12, windows-latest)	28s
test (3.13, ubuntu-latest)	18s
test (3.12, macos-latest)	16s
test (3.11, windows-latest)	18s
test (3.13, windows-latest)	18s
Combine & check coverage	0s
	7m 9s

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