Modify regex to detect other legitimate forms of provider block declaration

[bendbennett]

Closes: #264

[bflad]

Seems reasonable to me 🚀

[bflad]

FYI: I presume the same whitespace problem can occur with terraform{ as well, although terraform validate may not raise an error and Terraform may instead merge the terraform configuration block... configurations.

[bendbennett]

Good call. I can verify that having duplicate terraform blocks can lead to issues. For example:

        Error: Duplicate required providers configuration
        
          on terraform_plugin_test.tf line 13, in terraform:
          13:   required_providers {
        
        A module may have only one required providers configuration. The required
        providers were previously configured at terraform_plugin_test.tf:3,3-21.
    testing_new.go:80: Error retrieving state, there may be dangling resources: exit status 1

Have modified the regex for detection of terraform block, and updated the tests.

[austinvalle]

awesome! 🚀

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