* Upgrade Grail Bazel toolchain to latest release v0.7.2
This should allow Prysm to compile on Ubuntu 21.10 and 22.04
* Changes necessary in .bazelrc for new version of com_grail_bazel_toolchain
* Add cross compilation for OSX ARM64 (Apple Silicon)
* Update cross-toolchain README to include osx_arm64
* Add double quotes to shell code
* Rename install_clang_cross10.sh -> install_clang_cross.sh
* Update with prysmatic labs uploaded assets
* Touch README to trigger CI
* Revert "Touch README to trigger CI"
This reverts commit 826ac8a6d8da4fe0bd8503511b00576e50861850.
Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>
Co-authored-by: prestonvanloon <preston@prysmaticlabs.com>
