Determine when Metrics Views can be instantiated

[kaylareopelle]

This issue exists to further investigate the questions raised in this thread: https://github.com/open-telemetry/opentelemetry-ruby/pull/1604/files/749a8207ac07823be5a032b2b4703c2f7380dcd1#r1683589311

When initially testing views, I was creating the instrument first and then creating the view. However, when we refactored the code to reduce the number of times we needed to collect views for a particular instrument, this process changed. Now, views must be created first and instruments created after.

Questions

• What do other languages do? Do they make the view and then the instrument?
• How do they find the views performantly?
• What does the spec say about adding views to instruments? Can a view be attached to an instrument at any time?
• What makes sense at the instrumentation level? Does that impact ideas about instantiation?

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