Add FIDL formatting to plugin

This feature allows users of VS Code to use the standard formatting
mechanism (from the Command Palette or via format-on-save) to format any
file marked as FIDL syntax. With this change, formatting of .fidl files
should start to Just Work.

Change-Id: I2695eac980aad1d2865ff7a89b42e37bbcc9489d
4 files changed
tree: 93a22b0b025958406e85d2cd2827a31e83b0bc3f
  1. .vscode/
  2. vscode-language-fidl/
  3. .gitignore
  4. .vscodeignore