feat(dunning): Add DunningCampaignsResolver

[rsempe]

This pull request introduces a new feature to manage and query dunning campaigns within an organization. The most important changes include adding new permissions, creating a resolver and query for dunning campaigns, and updating the GraphQL schema to support these queries.

GraphQL Resolvers and Types:

• app/graphql/resolvers/dunning_campaigns_resolver.rb: Created a new resolver for querying dunning campaigns with appropriate permissions and arguments.
• app/graphql/types/query_type.rb: Added dunning_campaigns field to the QueryType to use the new resolver.

Model and Query Enhancements:

• app/models/dunning_campaign.rb: Added ORDERS constant and ransackable_attributes method for sorting and searching. [1] [2]
• app/queries/dunning_campaigns_query.rb: Created a new query class to handle filtering, sorting, and pagination of dunning campaigns.

[ancorcruz]

looks good, left a few comments.