Update NativeAOT-LLVM infrastructure to current ABI

This issue tracks reimplementing the work from stale PR #4515, which has been closed because it is too far out of date to merge directly.

Original pull request

• PR #4515: Update NativeAOT-LLVM infrastructure to current ABI
• Original author: @cloutiertyler

What the original PR was trying to do

Summary - Update the experimental NativeAOT-LLVM build path (EXPERIMENTAL_WASM_AOT=1) to include all host function imports from ABI versions 10.0 through 10.4 - Fix the compiler package reference to work on both Windows x64 and Linux x64 (was hardcoded to Windows only) - Add a CI smoketest to verify AOT builds work on Linux x64 Context See 4514 for the full writeup on the CAOT situation. The wasi-experimental workload that all Cmodule builds depend on is deprecated and removed from .NET 9+. NativeAOT-LLVM is the recommended path forward for ahead-of-time compilation of Cto WebAssembly. The existing NativeAOT-LLVM support (added by RReverser in 713) was stale: missing imports added since then and a Windows-only package reference. Changes SpacetimeDB.Runtime.targets: - Add 10 missing WasmImport declarations across spacetime_10.0 through 10.4 - Replace runtime.win-x64.Microsoft.DotNe...

Closure context

• This is being picked up by @rekhoff @JasonAtClockwork and @lisandroct

Reimplementation notes

• Reimplement this work on top of current master in a new PR.
• Keep the original PR linked as historical context and as a source of useful implementation ideas where still relevant.

Start by inspecting the current NativeAOT-LLVM implementation on master and the historical PR #4515, especially SpacetimeDB.Runtime.targets. Reconcile the ABI imports for versions 10.0 through 10.4, check the compiler package behavior on Windows x64 and Linux x64, and add the Linux x64 AOT CI smoketest described in the issue. Done means the experimental AOT path builds against the current ABI on both platforms.