Adding TF support for configuring Data Forwarding Rules

[namangoya]

Added TF support for data forwarding /rules.

Slack Conversation - link

• The tests are failing because of this issue, hence I am not adding the test as a part of this PR. I have locally ran the tests and they are passing, so we will add those tests right after the above issue is fixed.

Documentation

• API docs - https://api.sumologic.com/docs/#operation/createDataForwardingRule
• Data forwarding Documentation - https://help.sumologic.com/docs/manage/data-forwarding/amazon-s3-bucket/#forward-datato-s3

Please review commit by commit

Attaching the screenshots of passing tests in my local. (Rule is getting created and then updated)

[ssharma-sumologic]

Added some comments, rest lgtm

[namangoya]

I've tested the changes manually also and everything is working fine, attaching the main.txt (rename it to main.tf) and test results.

Steps to test

• Rename the main.txt file to main.tf
• Copy the main.tf in /terraform-provider-sumologic directory (i.e. in the repo itself), and populate the variables
• Run make install-dev
• Run terraform init
• Run terraform plan
• Run terraform apply

Flow of the tests is

Creating resources

• Run terraform plan and verify the plan and then run terraform apply
• Creating a partition.
• Creating a data forwarding destination.
• Configuring the data forwarding rule on the above partition.

Deleting resources

• Comment out the resource and run terraform apply, it will delete all the 3 resources it created above