Let the user know if there is a view name conflict

[ocelotl]

From the spec:

Try to apply the View configuration. If there is an error or a conflict (e.g. the View requires to export the metrics using a certain name, but the name is already used by another View), provide a way to let the user know (e.g. expose self-diagnostics logs).

This was updated yesterday to:

Try to apply the View configuration. If applying the View results in conflicting metric identities the implementation SHOULD apply the View and emit a warning. If it is not possible to apply the View without producing semantic errors (e.g. the View sets an asynchronous instrument to use the Explicit bucket histogram aggregation) the implementation SHOULD emit a warning and proceed as if the View did not exist.