resource/aws_emr_cluster: Add master_instance_group and core_instance…

…_group configuration blocks, deprecate other instance group configuration methods

Reference: #8245

Output from acceptance testing:

```
--- PASS: TestAccAWSEMRCluster_CoreInstanceGroup_AutoscalingPolicy (487.78s)
--- PASS: TestAccAWSEMRCluster_CoreInstanceGroup_BidPrice (1006.42s)
--- PASS: TestAccAWSEMRCluster_CoreInstanceGroup_InstanceCount (1004.90s)
--- PASS: TestAccAWSEMRCluster_CoreInstanceGroup_InstanceType (869.47s)
--- PASS: TestAccAWSEMRCluster_CoreInstanceGroup_Migration_CoreInstanceType (415.45s)
--- PASS: TestAccAWSEMRCluster_CoreInstanceGroup_Migration_InstanceGroup (485.50s)
--- PASS: TestAccAWSEMRCluster_CoreInstanceGroup_Name (769.30s)
--- PASS: TestAccAWSEMRCluster_MasterInstanceGroup_BidPrice (849.98s)
--- PASS: TestAccAWSEMRCluster_MasterInstanceGroup_InstanceType (756.42s)
--- PASS: TestAccAWSEMRCluster_MasterInstanceGroup_Migration_InstanceGroup (414.36s)
--- PASS: TestAccAWSEMRCluster_MasterInstanceGroup_Migration_MasterInstanceType (423.02s)
--- PASS: TestAccAWSEMRCluster_MasterInstanceGroup_Name (735.58s)
```