[Metrics builder] Add sem conv support in metadata.yaml

[dmitryax]

Make it possible to refer to semconv constants in metatada.yaml instead of defining all the fields manually.

The metadata.yaml interface is debatable. The only thing we need is a constant name in the semconv package. We can also duplicate the metric name in the key as it's already done for consistency and fail if it doesn't match the attribute name in the semconv package. For example the following configuration

schema_version: v1.8.0
resource_attributes:
  cloud.account.id:
    semconv: AttributeCloudAccountID

Would read all the data from (description and type) from the constant comment.

As another option, if we can have the same mechanism to convert cloud.account.id into AttributeCloudAccountID, we can do the following:

schema_version: v1.8.0
resource_attributes:
  cloud.account.id:
    semconv_defined: true

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