Swift Package Manager copy repository

This repository is a copy of https://github.com/firebase/boringssl with the git metadata removed to provide one to two orders of magnitude increase in speed for Swift Package Manager usage.

The source here should mirror what is released in the BoringSSL-GRPC CocoaPods used. There should be no changes to this repo other than updates from its mirror and Swift Package Manager specific items.

Versioning should follow normal sem-ver, as dependencies on this package are locked to the patch version. Non breaking edits to the Package manifest alone should be a patch version update.

The current 0.7.x versioning is a mapping to enable SPM-only updates to the 0.0.7 version of the source that is aligned with the CocoaPods version currently used by Firestore.

Releases should be normal tags, not marked as a "Release" via GitHub's interface.