fix(runtime): Lookup into native MD tables when searching by name

[mbektchiev]

Querying metadata for Objective-C interfaces and protocols should
not be done by the JS name when the string we search for is actually
their native name

• Introduce 2 additional global tables in metadata for Interfaces and Protocols
  indexed by their native name
• Make Metadata::GlobalTable a template struct and move its implementation
  to MetadataInlines.h
• Use the correct global table depending on the name and entity being looked up
• Add unit test with an objc_runtime_name attribute emulating that it's been
  generated by the Swift compiler

PR Checklist

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• Tests for the changes are included.

refs #712