Adding support for KeyConditionInput types

[mikeparisstuff]

Issue #, if available:

Implements work item one from #1062

Solves #1242

Description of changes:

Adds support for key condition input objects on @connection types.

Quoted from the RFC:

There is currently no support for passing sort key conditions to query operations created by the @connection directive. Key conditions offer a different set of operator than filter expressions so we are unable to reuse the ModelXFilterInput types that are currently generated. Read more about key conditions in the Amazon DynamoDB docs https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.KeyConditions.html.

Given a schema:

type Post @model {
  id: ID!
  name: String!
  comments: [Comment] @connection(name: "PostComments", keyField: "postId", sortField: "statusDate")
}

type Comment @model(queries: null) {
  id: ID!
  post: Post! @connection(name: "PostComments", keyField: "postId", sortField: "statusDate")
  postId: ID!
  statusDate: String!
}

This work would generate additional input types and update the generated connection resolver.

# The new input types.
input ModelStringKeyConditionInput {
  eq: String
  le: String
  lt: String
  ge: String
  gt: String
  beginsWith: String
  between: [String]
}

input ModelIDKeyConditionInput {
  eq: ID
  le: ID
  lt: ID
  ge: ID
  gt: ID
  beginsWith: ID
  between: [ID]
}

input ModelIntKeyConditionInput {
  eq: Int
  le: Int
  lt: Int
  ge: Int
  gt: Int
  between: [Int]
}

input ModelFloatKeyConditionInput {
  eq: Float
  le: Float
  lt: Float
  ge: Float
  gt: Float
  between: [Float]
}

# The updated post type
type Post {
  id: ID!
  name: String!

  # new statusDate sort key condition input
  comments(
    statusDate: ModelStringKeyConditionInput, 
    filter: ModelCommentFilterInput, 
    sortDirection: ModelSortDirection, 
    limit: Int, 
     nextToken: String
  ): ModelCommentConnection
}

With this in place you can create comments with a "statusDate" such as "PUBLISHED_2019-04-25" and then run a query like shown below to get a post and its comments published in April, 2019.

query {
  getPost(id: 1) {
    comments(statusDate: { beginsWith: "PUBLISHED_2019-04" }) {
      items {
        ...
      }
    }
  }
}

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[yuth]

👍 LGTM

[github-actions]

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