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This change defines and implements the SystemDataProvider interface.
This interface will be used by the Diagnostics App to provide
telemetric information about the system. go/cros-diagnostics-dd

- Creates mojo interface for SystemDataProvider.
- Implements GetSystemInfo() method. Additionally functionality to be
implemented in follow up CLs.
- Will be called by Diagnostics UI in a follow-up CL.

Bug: 1128204
Change-Id: If2a490b2a91dd9a0627f28dc523d195d4f148b3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402183
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809595}