Prompt transform parameter input while adding tags to struct

[bulentkazanci]

In the current version, Go: Add Tags prompts to get user input for only tags and options if go.addTags.promptForTags is true. With the following changes, it will also prompt for transform value too.

Closes the request

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[bulentkazanci]

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This PR is being closed because golang.org/cl/234659 has been merged.