Exclude files in .terraform from watching

[radeksimko]

I'm not sure which part of the extension exactly decides which files to watch and send as part of didChangeWatchedFiles, but I noticed that it's attempting to report files in the Terraform cache to the server:
https://gist.github.com/radeksimko/12e7d68005a95b87c2b4fd813354f888

I believe that .terraform should be excluded from these events (from being watched), because:

• Editing cached modules is not a practice we should be encouraging, so the server does not intend to support editing these files
• Even if there is some server logic which relies on .terraform contents, the server will likely always prefer watching and interpreting it directly from the disk, because it cannot rely on every server to watch hidden directories for essential functions. (some LSP plugins leave this as user-configurable, which leaves a lot of room for error)
• It can generate a lot of requests when terraform init runs

This is somewhat related to hashicorp/terraform-ls#137
The server doesn't support workspace/didChangeWatchedFiles yet and so it can generate more errors than expected as a result of the above.

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We may consider offloading watching to the client by dynamic registration of paths per https://microsoft.github.io/language-server-protocol/specification#workspace_didChangeWatchedFiles but I think that .terraform should be excluded by default.

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Related: hashicorp/terraform-ls#867

[radeksimko]

The extension actually doesn't currently send any watched (closed) files to the server, it may have in the past, but this is no longer relevant.

[github-actions]

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