feat: set global meter provider when configureMeterProvider is not defined

[pragmaticivan]

If you want to create a custom metric, there's no way to access the wrapper metric provider in the lambda code.

Usage:

const meter = metrics.getMeterProvider().getMeter('default');

getMeterProvider will return the globally configured meter provider

[tylerbenson]

Seems reasonable to me.

[serkan-ozal]

good catch!

[pragmaticivan]

Since we have a ticket targeting this as a bug, wondering if this should be released as a hotfix