fix: Allow Pipes with Kinesis Targets

[soisyourface]

Description

Add a dynamic block to the var.pipes[].target_parameters for kinesis_stream_parameters.partition_key.

Motivation and Context

module "doro-eventbridge" {
  source = "./modules/terraform-aws-eventbridge"
  # source   = "terraform-aws-modules/eventbridge/aws"
  # version  = "3.13.0"
  bus_name = "doro"

  pipes = {
    doro_test = {
      source = "${aws_kinesis_stream.streamA.arn}"
      target = "${aws_kinesis_stream.streamO.arn}"

      source_parameters = {
        kinesis_stream_parameters = {
          starting_position = "LATEST"
        }
      }
      target_parameters = {
        kinesis_stream_parameters = {
          partition_key = "$.deviceId"
        }
      }
    }
  }
}

Before the partition_key was not pulled in and therefore the create of the pipe always failed as it is a required field for creating a pipe with a kinesis target.

Breaking Changes

Additive so no expected breakage.

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects
• I have executed pre-commit run -a on my pull request

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[antonbabenko]

LGTM

[soisyourface]

Added the changes outlined in the #144 as requested.
This should be ready to go.

Thanks!

[antonbabenko]

This PR is included in version 3.14.2 🎉

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