Compile API: disable optimizations by default (#25474)
### Description
- Disables graph optimizations by default when using the explicit
compiling API.
- Adds `ModelCompilationOptions_SetGraphOptimizationLevel` to allow the
user to set an optimization level.
- Adds C++, Python, and C# bindings for the new API function.
- Updates `ModelCompilationOptions_SetFlags` to take in a `uint32_t
flags` parameter instead of `size_t flags` to ensure the same size
across platforms. This API is not yet in a public ORT release, so safe
to modify.
### Motivation and Context
When compiling, prefer allowing the EP to do the optimizations instead
of ORT.
