Watch **/*.tf and **/*.tfvars files for the language server

[radeksimko]

Complementary to hashicorp/terraform-ls#15

---

Background

The extension used to send updates about **/*.tf between v2.0.0 and v2.2.0
d6396b5#diff-04bba6a35cad1c794cbbe677678a51de13441b7a6ee8592b7b50be1f05c6f626L124
but for various reasons - esp. because the server wasn't ready - and still isn't - for handling these updates - it was removed.

Currently the extension doesn't send any updates about any files (except for the open files) to the server. The server may request globs to watch via relevant LSP capability, as described in hashicorp/terraform-ls#867

It would however make sense for the extension to just always send updates for the files that it generally claims to support, i.e. **/*.tf and **/*.tfvars.

https://github.com/microsoft/vscode-extension-samples/blob/2556c82cb333cf65d372bd01ac30c35ea1898a0e/lsp-sample/client/src/extension.ts#L42-L45

Proposal

• Introduce watchers for the two globs (**/*.tf and **/*.tfvars) in

  vscode-terraform/src/clientHandler.ts

  Lines 79 to 88 in bc90108

  	const clientOptions: LanguageClientOptions = {
  	documentSelector: documentSelector,
  	initializationOptions: initializationOptions,
  	initializationFailedHandler: (error) => {
  	this.reporter.sendTelemetryException(error);
  	return false;
  	},
  	outputChannel: this.outputChannel,
  	revealOutputChannelOn: RevealOutputChannelOn.Never,
  	};

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