config: Create SDK from model

[pellared]

Add a function which creates SDK from model.

E.g.

package config

// NewSDK creates SDK providers based on the configuration model.
func NewSDK(ctx, context.Context, c *OpenTelemetryConfiguration) (*SDK, error) {}

type SDK struct {}
func (sdk *SDK) Shutdown() error {}
func (sdk *SDK) TraceProvider() *trace.TraceProvider {}
func (sdk *SDK) MeterProvider() *meter.MeterProvider {}

[pellared]

PTAL @codeboten

[codeboten]

@pellared already started on this, please assign it to me when you have a moment