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IDL compiler: Make IdlType a well-defined public interface

- Added all the APIs into IdlType
- Simplified function docstring
- Made the order of API listing consistent with class
   definitions

This is a preparation to implement ReferenceType's proxy.

Bug: 839389
Change-Id: I43ecdbdab9b84fbcc2503b64adb470b74fa1c0ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1698121Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676816}