feat(instrumentation-graphql): add parent name in attributes of resolver span

[antogyn]

Which problem is this PR solving?

I am trying to derive performance metrics from GraphQL traces.

Currently, I cannot consistently measure the performance of a specific, logical resolver, identified by the combination of its parent type name and field name.

While the existing graphql.field.path attribute is available, it is query-path dependent. Consider this simplified schema and two queries hitting the same name resolver:

type Account {
  name: String! # <-- Logical Resolver: Account.name
}
type Query {
  account(id: ID!): Account # Query 1
  user(id: ID!): User
}
type User {
  accounts: [Account!]! # Query 2
}

Execution	Field Name (graphql.field.name)	Field Path (graphql.field.path)
Query 1: query { account { name } }	name	Query.account.name
Query 2: query { user { accounts { name } } }	name	Query.user.accounts.name

Both queries execute the same Account.name resolver, but the existing graphql.field.path differs. This makes it impossible to aggregate all performance data for Account.name using the existing attributes.

Short description of the changes

This PR adds the parent type name to a new attribute on resolver spans

1. I've added graphql.parent.name to the AttributeNames enum.
2. The instrumentation records the parent type name using info.parentType.name in this new attribute.

[linux-foundation-easycla]

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• ✅ login: antogyn / name: Anthony Giniers (055910f)

[obecny]

lgtm, thx for contribution

[raphael-theriault-swi]

Thank you for the contribution !