Change set_attributes to take a Mapping

[camillol]

Description

The attributes argument is currently specifies as a Dict[str, types.AttributeValue], which is invariant in its value type. As a result, you cannot pass a dictionary with a narrower value type, e.g. a dict[str, str]. But that should be allowed, since set_attributes simply adds all key-value pairs in its argument, and all such pairs are valid. Using Mapping takes care of this issue, since it's covariant in its value type.

Type of change

Please delete options that are not relevant.

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

How Has This Been Tested?

• Basic repro:

from opentelemetry import trace

span = trace.get_current_span()
attrs = {
    "key": "value",
}
span.set_attributes(attrs)

Check this with pyright. Without this change, you get an error like:

error: Argument of type "dict[str, str]" cannot be assigned to parameter "attributes" of type "Dict[str, AttributeValue]" in function "set_attributes"
  "dict[str, str]" is not assignable to "Dict[str, AttributeValue]"
    Type parameter "_VT@dict" is invariant, but "str" is not the same as "AttributeValue"
    Consider switching from "dict" to "Mapping" which is covariant in the value type (reportArgumentType)

With this change, it passes.

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated