Add graphql support for taxonomy

[adithyasamavedhi-ttd]

What does this MR do:

• Adds graphQL support for the taxonomy GraphQL operations

REST → GraphQL → SDK mapping

REST endpoint	What it does	GraphQL operation	ttd-data SDK function
POST /v3/thirdpartydata	Create third-party taxonomy segments	mutation thirdPartyDataUpsert(input: [ThirdPartyDataUpsertInput!]!) → ThirdPartyDataUpsertResults	client.third_party_taxonomy.upsert_segments(...) — 1–1000 SegmentInput per call
PUT /v3/thirdpartydata	Update existing segments	Same mutation — the server returns mode: CREATE | UPDATE per segment	client.third_party_taxonomy.upsert_segments(...) — omit a key to leave that field unchanged
POST /v3/thirdpartydata/query	Look up segments for a provider, optionally filtered by element ID	thirdPartyDataProvider(id).thirdPartyTargetingDataSegments(where: {providerElementId: {in: [...]}}, first, after)	client.third_party_taxonomy.query_segments(...)
GET /v3/thirdpartydata/status/{providerId}/{providerElementId}	Read a single segment's taxonomy approval status	Same connection, where: {providerElementId: {eq: ...}}, selecting taxonomyApprovalStatus	client.third_party_taxonomy.query_segment_taxonomy_status(...)

• Add support to execute custom graphql queries if the user comes up with the query
• Adds a scirpt to validate the graphql documents against the schema using instrospction ( currently runs on-demand)
• Adds a example script to run graphql operations for testing

Tests:

1. Query Segments:

2. Query Segments next page:

3. Create Segments:

4. Get Taxonomy Approval Status: