[graphics] Implement TGraphPolar::SavePrimitive #25807

Job	Run time
mac-beta ARM64	25m 38s
Windows 10 x86 Release	41m 10s
Upload Event Payload	5s
Windows 10 x64 Release	48m 0s
mac14 X64 CMAKE_CXX_STANDARD=20	36m 4s
mac15 ARM64 CMAKE_CXX_STANDARD=23	15m 56s
mac26 ARM64	15m 14s
fedora42 CMAKE_CXX_STANDARD=23	25m 8s
alma9 CMAKE_BUILD_TYPE=Debug	17m 20s
ubuntu2504 CMAKE_CXX_STANDARD=23	30m 21s
alma10	21m 26s
fedora43	21m 22s
debian125 CMAKE_CXX_STANDARD=20, dev=ON, CMAKE_CXX_FLAGS=-Wsuggest-override	11m 33s
ubuntu2510	20m 45s
alma8	22m 58s
ubuntu2404 CMAKE_BUILD_TYPE=Debug	22m 15s
alma10 clang Ninja CMAKE_C_COMPILER=clang, CMAKE_CXX_COMPILER=clang++	18m 54s
debian13 dev=ON, CMAKE_CXX_FLAGS=-Wsuggest-override	12m 29s
alma9 march_native CMAKE_BUILD_TYPE=RelWithDebInfo, CMAKE_CXX_FLAGS=-march=native, CMAKE_C_FLAGS=-march=native, builtin_zlib=ON, builtin_zstd=ON	20m 23s
rawhide Fedora pydebug CMAKE_CXX_STANDARD=23	20m 48s
alma9 arm64 CMAKE_BUILD_TYPE=RelWithDebInfo, builtin_zlib=ON, builtin_zstd=ON	25m 58s
alma9 modules_off runtime_cxxmodules=Off	18m 12s
ubuntu22 imt=Off, CMAKE_BUILD_TYPE=Debug	19m 56s
	8h 31m 55s

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