Initializes targets for SDK companion images.
Example Usage: ```
Initializing the repo:
load("@rules_fuchsia//fuchsia:deps.bzl", "fuchsia_products_repository")
fuchsia_products_repository( name = "fuchsia_products", cipd_bin = "@cipd_tool//:cipd", ensure_file = "//manifests:product_bundles.ensure", )
Examining the generated targest:
$ bazel query '@fuchsia_products//... except attr("tags", "manual", @fuchsia_products//...)'
Using the targets:
$ bazel run @fuchsia_products//:core.x64.emu -- --headless
$ bazel run @fuchsia_products//:core.vim3.flash
## **ATTRIBUTES**
| Name | Description | Type | Mandatory | Default |
| :------------- | :------------- | :------------- | :------------- | :------------- |
| name | A unique name for this repository. | <a href="https://bazel.build/concepts/labels#target-names">Name</a> | required | - |
| repo_mapping | In `WORKSPACE` context only: a dictionary from local repository name to global repository name. This allows controls over workspace dependency resolution for dependencies of this repository.<br><br>For example, an entry `"@foo": "@bar"` declares that, for any time this repository depends on `@foo` (such as a dependency on `@foo//some:target`, it should actually resolve that dependency within globally-declared `@bar` (`@bar//some:target`).<br><br>This attribute is _not_ supported in `MODULE.bazel` context (when invoking a repository rule inside a module extension's implementation function). | <a href="https://bazel.build/rules/lib/toplevel/attr#string_dict">String Dict</a> | optional | - |
| cipd_bin | The cipd binary that will be used to download the companion image metadata. | <a href="https://bazel.build/rules/lib/toplevel/attr#label">Label</a> | optional | `None` |
| ensure_file | A cipd ensure file to use to download the companion image metadata. | <a href="https://bazel.build/rules/lib/toplevel/attr#label">Label</a> | optional | `None` |
| metadata_file | A label referencing product_bundles.json. | <a href="https://bazel.build/rules/lib/toplevel/attr#label">Label</a> | optional | `None` |
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