fix: preserve method and class name decorated with OtelXxxCounter

[Papooch]

Which problem is this PR solving?

The same problem as #538

Short description of the changes

• Use Proxy to preserve decorated method name.
• Explicitly define name property on decorated class.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• added tests to common.spec.ts

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated (not needed)

[pragmaticivan]

Thx!