Change gogoproto compiler to protoc-gen-go-cast (#8697)

* Remove gogoproto compiler

* Remove more gogoproto

* Improvements

* Fix gengo

* More scripts

* Gazelle, fix deps

* Fix version and errors

* Fix gocast for arrays

* Fix ethapis

* Fixes

* Fix compile errors

* fix go.mod

* //proto/... builds

* Update for protov2

* temp fix compilation to move on

* Change everything to emptypb.empty

* Add grpc to proto/slashings

* Fix almost all build failures

* Oher build problems

* FIX THIS FUCKING THING

* gaz literally every .bazel

* Final touches

* Final final touches

* Fix proto

* Begin moving proto.Marshal to native

* Fix site_data

* Fixes

* Fix duplicate gateway

* Fix gateway target

* Fix ethapis

* Fixes from review

* Update

* Fix

* Fix status test

* Fix fuzz

* Add isprotoslice to fun

* Change DeepEqual to DeepSSZEqual for proto arrays

* Fix build

* Fix gaz

* Update go

* Fixes

* Fixes

* Add case for nil validators after copy

* Fix cast

* Fix test

* Fix imports

* Go mod

* Only use extension where needed

* Fixes

* Split gateway from gengo

* gaz

* go mod

* Add back hydrated state

* fix hydrate

* Fix proto.clone

* Fies

* Revert "Split gateway from gengo"

This reverts commit 7298bb2054.

* Revert "gaz"

This reverts commit ca95256570.

* Merge all gateway into one target

* go mod

* Gaz

* Add generate v1_gateway files

* run pb again

* goimports

* gaz

* Fix comments

* Fix protos

* Fix PR

* Fix protos

* Update grpc-gateway and ethapis

* Update ethapis and gen-go-cast

* Go tidy

* Reorder

* Fix ethapis

* fix spec tests

* Fix script

* Remove unused import

* Fix fuzz

* Fix gomod

* Update version

* Error if the cloned result is nil

* Handle optional slots

* ADd more empty checks to clone

* Undo fuzz changes

* Fix build.bazel

* Gaz

* Redo fuzz changes

* Undo some eth1data changes

* Update go.mod

Co-authored-by: Preston Van Loon <preston@prysmaticlabs.com>

* Undo clone beacon state

* Remove gogo proto more and unused v1_gateway

* Add manual fix for nil vals

* Fix gaz

* tidy

* Tidy again

* Add detailed error

* Revert "Add detailed error"

This reverts commit 59bc053dcd.

* Undo varint changes

* Fix nil validators in deposit test

* Commit

* Undo

Co-authored-by: Preston Van Loon <preston@prysmaticlabs.com>
Co-authored-by: Radosław Kapka <rkapka@wp.pl>
Co-authored-by: Nishant Das <nishdas93@gmail.com>
Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>

WORKSPACE

@@ -286,9 +286,9 @@ buildifier_dependencies()
 
 git_repository(
     name = "com_google_protobuf",
-    commit = "fde7cf7358ec7cd69e8db9be4f1fa6a5c431386a",  # v3.13.0
+    commit = "436bd7880e458532901c58f4d9d1ea23fa7edd52",
     remote = "https://github.com/protocolbuffers/protobuf",
-    shallow_since = "1597443653 -0700",
+    shallow_since = "1617835118 -0700",
 )
 
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")