Support instrumentation scope attributes

[srikanthccv]

• Add optional scope attributes for tracer creation
• Add optional scope attributes for meter creation
• Add optional scope attributes for logger creation

and the attributes should not be part of meter/tracer/logger identity

[lzchen]

Does this not apply to logs as well? Also the scope attributes should not be part of tracer identity either right?

[srikanthccv]

You are correct about the identity part - updated the description. And as you know we don't have get_logger similar to get_{tracer,meter} since we don't have the API and it's implementation. I didn't include logs in the description for that reason.