[TextServer / Font] Add support for customizable baseline offset. #20952

Job	Run time
📊 Static checks / Code style, file formatting, and docs	29s
🍏 iOS / Template (target=template_release)	6m 19s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	8m 3s
🍎 macOS / Editor (target=editor, tests=yes)	27m 47s
🌐 Web / Template w/o threads (target=template_release, threads=no)	8m 11s
🤖 Android / Template (target=template_release)	9m 40s
🍎 macOS / Template (target=template_release)	17m 27s
🐧 Linux / Editor w/ Mono (target=editor)	16m 41s
🏁 Windows / Editor (target=editor, tests=yes)	19m 2s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	22m 38s
🏁 Windows / Template (target=template_release)	8m 47s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	16m 30s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	16m 2s
🐧 Linux / Template w/ Mono (target=template_release)	6m 14s
🐧 Linux / Minimal template (target=template_release, everything disabled)	5m 56s
🪲 Godot CPP / Build and test Godot CPP	6m 43s
	3h 16m 29s

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