Add EC_Scalar and EC_AffinePoint types #5408

Job	Run time
Clang Tidy	2m 28s
Linux (gcc, shared)	2m 49s
Analysis (coverage, gcc, ubuntu-24.04)	27m 54s
Linux (gcc, amalgamation)	4m 36s
macOS (shared, xcode, macos-13)	4m 33s
Analysis (sanitizer, msvc, windows-2022, ninja)	19m 11s
Linux (gcc, static)	2m 53s
macOS (amalgamation, xcode, macos-13)	5m 11s
Analysis (sanitizer, clang, ubuntu-24.04)	13m 6s
Linux (clang, shared)	3m 0s
macOS (shared, xcode, macos-14)	2m 42s
Analysis (sanitizer, gcc, ubuntu-24.04)	19m 55s
macOS (amalgamation, xcode, macos-14)	3m 10s
Analysis (valgrind, clang, ubuntu-24.04)	37m 46s
Analysis (fuzzers, gcc, ubuntu-24.04)	7m 59s
Special (examples, gcc, ubuntu-24.04)	2m 35s
Windows (shared, x86_64, windows-2022)	7m 46s
Special (minimized, gcc, ubuntu-24.04)	39s
Analysis (lint, gcc, ubuntu-24.04)	1m 6s
Windows (static, x86_64, windows-2022)	5m 57s
Special (bsi, gcc, ubuntu-24.04)	1m 39s
Analysis (format, gcc, ubuntu-24.04)	37s
Windows (amalgamation, x86_64, windows-2022)	5m 6s
Special (docs, gcc, ubuntu-24.04)	52s
Analysis (limbo, gcc, ubuntu-24.04)	2m 30s
Windows (shared, x86, windows-2022)	8m 38s
Cross (cross-i386, gcc, ubuntu-22.04)	4m 23s
Cross (cross-arm32, gcc, ubuntu-24.04)	11m 2s
Cross (cross-arm64, gcc, ubuntu-24.04)	7m 54s
Cross (cross-ppc64, gcc, ubuntu-24.04)	6m 46s
Cross (cross-mips64, gcc, ubuntu-24.04)	7m 55s
Cross (cross-android-arm64, clang, ubuntu-24.04)	1m 53s
Cross (static, gcc, windows-2022, make)	6m 33s
Cross (cross-ios-arm64, xcode, macos-13)	7m 17s
	4h 8m 21s

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