add-rates-graphql-support

[adithyasamavedhi-ttd]

What does this PR do?

• Adds support for rates through graphql

REST endpoint	What it does	GraphQL operation	ttd-data SDK function
POST /v3/datarate/batch	Submit a batch of data rate creates/deletes for a provider	mutation DataRateBatchCreate(input: DataRateBatchCreateInput!) → dataRateBatchCreate	client.third_party_data_rate.create_data_rate_batch(...) — 1–5000 DataRateInput per call
GET /v3/datarate/batch/{batchId}	Read a data rate batch's processing/approval status	thirdPartyDataProvider(id).dataRateBatches(where: {id: {eq: ...}})	client.third_party_data_rate.query_data_rate_batches(...) — pass batch_id to filter to one
GET /v3/datarate/brands/{providerId}	List the third-party data brands belonging to a provider	thirdPartyDataProvider(id).thirdPartyDataBrands(first, after)	client.third_party_data_rate.query_brands(...)
POST /v3/datarate/query	Look up data rates for a provider, optionally filtered by segment or brand	thirdPartyDataProvider(id).thirdPartyTargetingDataSegments(where, first, after) { providerDataRates(where: rateWhere) }	client.third_party_data_rate.query_segment_data_rates(...)

Tests:

1. Create a DataRate Batch

2. Get the details of a DataRate Batch based on Batch id:

3. Get the Brands associated with a DataProviderId:

4.Get the DataRates and filter: