[vector_graphics_compiler] Add modern HSL color parsing (#11657) ## Description Follow-up to flutter/packages#11619 and flutter/flutter#185833. This moves HSL/HSLA function parsing from `parser.dart` into `colors.dart`, following the existing `parseCssRgb` / `parseRgbFunction` structure. It also adds support for the same practical legacy/modern syntax split already supported for RGB: - legacy comma-separated syntax, e.g. `hsl(270, 100%, 76%)` - modern space-separated syntax, e.g. `hsl(270 100% 76% / 0.5)` This is intentionally scoped to the existing regex-based numeric parser style; it does not attempt to implement the full CSS Color 4 grammar. ## Tests - Added `parseCssHsl` record parser tests covering legacy syntax, modern syntax, whitespace/case variations, decimal/negative tokens, and invalid syntax. - Added `SvgParser.parseColor` tests for modern HSL/HSLA conversion and HSLA alpha behavior. - Added HSLA alpha boundary and clamp tests for `0`, `0%`, `1`, `100%`, `50%`, `-0.5`, `-10%`, `2`, and `150%`. Ran locally: ```sh flutter test test/colors_test.dart test/parsers_test.dart dart analyze lib/src/svg/colors.dart lib/src/svg/parser.dart test/colors_test.dart test/parsers_test.dart ``` ## Related Issues Fixes https://github.com/flutter/flutter/issues/186153
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