Suppress logging when invoked via language binding

[discount-elf]

Utilizing:

pkl: 0.27.1 on MacOS
pkl-go: 0.8.1

I receive these info logs:

{"time":"2024-12-11T15:16:26.898523-06:00","level":"INFO","msg":"warn: Cannot find field on Go struct `pkl.ProjectEvaluatorSettings` matching Pkl property `color`. Ensure the Go structs are up to date with Pkl classes either through codegen or manually adding `pkl` tags."}
{"time":"2024-12-11T15:16:26.898544-06:00","level":"INFO","msg":"warn: Cannot find field on Go struct `pkl.ProjectEvaluatorSettings` matching Pkl property `externalModuleReaders`. Ensure the Go structs are up to date with Pkl classes either through codegen or manually adding `pkl` tags."}
{"time":"2024-12-11T15:16:26.898547-06:00","level":"INFO","msg":"warn: Cannot find field on Go struct `pkl.ProjectEvaluatorSettings` matching Pkl property `externalResourceReaders`. Ensure the Go structs are up to date with Pkl classes either through codegen or manually adding `pkl` tags."}
{"time":"2024-12-11T15:16:26.898551-06:00","level":"INFO","msg":"warn: Cannot find field on Go struct `pkl.Project` matching Pkl property `annotations`. Ensure the Go structs are up to date with Pkl classes either through codegen or manually adding `pkl` tags."}

Code:

evaluator, err := pkl.NewProjectEvaluator(context.Background(), projectDir, pkl.PreconfiguredOptions, func(opts *pkl.EvaluatorOptions) {
	opts.OutputFormat = "json"
})

Ideally it would be useful to be able suppress logging, in the event of a delay/mismatch between the pkl release and the language binding.

[bioball]

Makes sense!