internal: expose pending tf related options via init opts

[danishprakash]

Closes #240

[radeksimko]

Thanks for this 2nd PR as well.

Aside from my two inline comments it looks good.

We'll also need to document these new options in https://github.com/hashicorp/terraform-ls/blob/main/docs/SETTINGS.md but I'm happy to do that prior to merging.

[radeksimko]

Actually one more thing:
Can you also prepend the relevant two CLI flags with (DEPRECATED)?

terraform-ls/internal/cmd/serve_command.go

Lines 46 to 49 in 0059475

	fs.StringVar(&c.tfExecTimeout, "tf-exec-timeout", "", "Overrides Terraform execution timeout (e.g. 30s)")
	fs.StringVar(&c.tfExecLogPath, "tf-log-file", "", "path to a file for Terraform executions"+
	" to be logged into with support for variables (e.g. Timestamp, Pid, Ppid) via Go template"+
	" syntax {{.VarName}}")

Thanks.

[radeksimko]

LGTM, I just made some minor changes to the docs and log message.

Thanks for the PR.

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