Fix clang-tidy warnings to make it actually useful

[azrogers]

When we first added clang-tidy to Cesium Native, we left the warnings as merely informational, because there were too many of them to fix at the moment. Unfortunately, this leaves clang-tidy as an afterthought, because I don't imagine many of us are poking through the CI logs to see if our changes produced any new clang-tidy warnings when there's already hundreds of existing warnings. This change attempts to fix this: resolve the existing warnings, enable any useful checks that weren't already enabled, and treat the warnings as errors so we'll notice them.

Changes in this PR:

• clang-tidy on CI now uses clang-tidy version 19, because earlier versions don't support the ExcludeHeaderFilterRegex config option we're using to remove ezvcpkg headers from the build.
• We are now following Include-What-You-Use, thanks to clang-tidy's misc-include-cleaner check. This has resulted in pretty much every file in the project receiving a change, but it's worth it.
• Every bugprone clang-tidy check has been enabled, with the following exceptions:
  • bugprone-exception-escape, as fixing this is already a pending issue (Functions are declared noexcept, even though they may throw #348).
  • bugprone-misplaced-widening-cast, as it results in extremely verbose lines (like size_t pixels = static_cast<size_t>(image.width) * static_cast<size_t>(image.height) * static_cast<size_t>(image.channels) instead of just size_t pixels = static_cast<size_t>(image.width * image.height * image.channels).
  • bugprone-unhandled-exception-at-new, as this is both part of Functions are declared noexcept, even though they may throw #348, and also extremely nitpicky - I don't think we need to wrap every call to new in a try...catch.
• Most modernize and misc checks have been enabled, where they didn't conflict with the style guide or produce way too many changes for one PR. The following I decided were too much for just this PR, but they can be automatically applied at a later date using clang-tidy-fix:
  • misc-const-correctness detects every variable that could be declared const.
  • modernize-loop-convert uses range-based for loops instead of manually advancing the iterator.
  • modernize-type-traits changes traits<...>::type and traits<..>::value to traits_t<...> and traits_v<...>
  • modernize-use-constraints replaces std::enable_if with C++20 requires clauses.
  • modernize-use-using replaces typedef with using.
  • modernize-return-braced-init-list replaces statements like return glm::dvec2(0.5, 0.5); with return {0.5, 0.5};
  • modernize-use-designated-initializers would mean adding .field= to initializer statements, like {.x = 0.5, .y = 0.5}, which would prevent bugs when changing the order of fields.
• All performance checks have been enabled, with the exception of performance-enum-size, as I felt that saving three bytes by defining an enum with int8_t instead of the default int32_t didn't seem like it was worth the change.
• readability checks are mostly style guide-related, but might be worth looking into. readability-else-after-return and readability-braces-around-statements seem like they could be good to add.
• All warnings are now treated as errors.

Fixes #203