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imgcodecs: fix Sun Raster encoding checks 🤖🤖🤖 - #29894 SunRasterDecoder saves the header's ras_type field in m_encoding but several validation and decoding checks compared RAS_BYTE_ENCODED and RAS_FORMAT_RGB against m_type. This caused valid byte-encoded and RGB-format Sun Raster images to be rejected before their existing decoding paths could be used. This patch uses the file encoding to make these decisions and limits byte encoding to 8-bit input and RGB-format input to the supported 24- and 32-bit paths. It also selects channel conversion from the file and requested output orders and avoids indexed-palette conversion when decoding truecolor inputs as grayscale. The regression tests use Sun Raster files written by Netpbm's `pnmtorast -rle` and ImageMagick's SUN encoder. The matching `opencv_extra` PR (opencv/opencv_extra#1408) contains these files and lets them be inspected independently with compatible image viewers. The tests verify exact RLE literal and run values, truncated RLE input, 24- and 32-bit RGB-format input, BGR and RGB output, and grayscale conversion. The Netpbm file also exposed an existing row-padding error in the RLE path: the decoder consumed a padding byte after even-width rows, although those rows require no padding. The patch now consumes that byte only for odd-width rows. No public API is changed. ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [ ] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake