feat(datasource): pinecone_collection

[thiskevinwang]

Description

This introduces a pinecone_collection data-source

provider "pinecone" {}

data "pinecone_collection" "existing-collection" {
  name = "testindex"
}

resource "pinecone_index" "my-first-index" {
  name   = "testidx"
  metric = "cosine"
  pods   = 1

  source_collection = data.pinecone_collection.existing-collection.name
  dimension = data.pinecone_collection.existing-collection.dimension
}