Serialized file API

This creates a module for serializing and deserializing data to and from
files on the filesystem, with TOML as the initially supported format.

Change-Id: I57c8b397507334329d2b1ea8a17e69d645bc4706
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/qg/+/119992
Reviewed-by: Erik Gilling <konkers@google.com>
Commit-Queue: Alexei Frolov <frolv@google.com>
5 files changed
tree: c70c360265e60462a9bcb361522fb32109489550
  1. qg/
  2. qg-cli/
  3. tools/
  4. .gitignore
  5. Cargo.lock
  6. Cargo.toml
  7. rustfmt.toml