imgproc: C-API cleanup, drawContours refactor #5875

Job	Run time
Ubuntu2204-x64 / BuildAndTest	30m 41s
Ubuntu2204-x64 / BuildContrib	1m 52s
Android-SDK / BuildAndTestSDK	12m 48s
Ubuntu2004-ARM64 / BuildAndTest	37m 3s
Ubuntu2004-ARM64 / BuildContrib	10m 21s
Ubuntu2004-ARM64-Debug / BuildAndTest	1h 3m 49s
Ubuntu2004-ARM64-Debug / BuildContrib	5m 48s
Ubuntu2004-x64 / BuildAndTest	32m 6s
Ubuntu2004-x64 / BuildContrib	2m 26s
Ubuntu2004-x64-OpenVINO / BuildAndTest	19m 52s
Windows10-x64 / BuildAndTest	59m 49s
Windows10-x64 / BuildContrib	23m 57s
iOS / Build	18m 45s
macOS-ARM64 / BuildAndTest	13m 53s
macOS-ARM64 / BuildContrib	3m 4s
macOS-ARM64-Vulkan / BuildAndTest	6m 4s
macOS-x64 / BuildAndTest	42m 0s
macOS-x64 / BuildContrib	3m 18s
Ubuntu2004-x64-CUDA / BuildAndTest	8m 14s
Android-Test / BuildAndTest	5m 9s
docs / BuildAndTest	5m 25s
Linux-RISC-V-Clang / BuildAndTest	36m 26s
Linux-RISC-V-Clang / BuildContrib	1m 5s
TIM-VX / x86-simulator-build-test	29m 33s
Windows10-ARM64 / CrossBuild	11m 29s
Windows10-x64-Vulkan / BuildAndTest	24m 44s
TIM-VX / khadas-vim3-tests	0s
	8h 29m 41s

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