imgproc: C-API cleanup, drawContours refactor #5874

Job	Run time
Ubuntu2004-x64 / BuildAndTest	46m 25s
Ubuntu2004-x64 / BuildContrib	11m 1s
Ubuntu2004-x64-OpenVINO / BuildAndTest	34m 58s
macOS-ARM64-Vulkan / BuildAndTest	12m 57s
macOS-x64 / BuildAndTest	1h 20m 5s
macOS-ARM64 / BuildContrib	17m 43s
macOS-ARM64 / BuildAndTest	23m 25s
macOS-x64 / BuildContrib	45m 20s
Ubuntu2004-ARM64 / BuildAndTest	42m 42s
Ubuntu2004-ARM64 / BuildContrib	16m 56s
Ubuntu2004-ARM64-Debug / BuildContrib	7m 26s
Ubuntu2004-ARM64-Debug / BuildAndTest	1h 7m 8s
Ubuntu2004-x64-CUDA / BuildAndTest	13m 20s
Ubuntu2204-x64 / BuildAndTest	41m 6s
Ubuntu2204-x64 / BuildContrib	11m 17s
Android-SDK / BuildAndTestSDK	1s
Android-Test / BuildAndTest	5m 16s
docs / BuildAndTest	5m 21s
iOS / Build	39m 16s
Linux-RISC-V-Clang / BuildAndTest	36m 53s
Linux-RISC-V-Clang / BuildContrib	1m 6s
TIM-VX / x86-simulator-build-test	29m 46s
Windows10-ARM64 / CrossBuild	14m 56s
Windows10-x64 / BuildAndTest	1h 6m 32s
Windows10-x64 / BuildContrib	28m 51s
Windows10-x64-Vulkan / BuildAndTest	26m 22s
TIM-VX / khadas-vim3-tests	0s
	12h 6m 9s

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