Plugin execution fails on Windows

[pl4nty]

Describe the bug

The plugin is distributed for Windows with an exe file extension, which is what Terraform assumes when trying to execute it. However, the following regex causes the plugin to exit as soon as it loads:

terraform-provider-openapi/main.go

Line 97 in 53c0585

r, err := regexp.Compile("\\bterraform-provider-([a-zA-Z0-9]+)(?:_v[\\d]+\\.[\\d]+\\.[\\d]+)?\\b$")

provider binary name terraform-provider-myprovider.exe does not match terraform naming convention

To Reproduce

Steps to reproduce the behavior:

1. Download plugin for Windows
2. Execute plugin
3. Optionally, install and rename to remove file extension
4. Observe plugin now executes fine when run directly: Start-Process -FilePath [path to binary] -NoNewWindow
5. Set $env:TF_LOG="Debug" and observe plugin failing to load in Terraform