gRPC Gateway Removal (#14089)

* wip passing e2e

* reverting temp comment

* remove unneeded comments

* fixing merge errors

* fixing more bugs from merge

* fixing test

* WIP moving code around and fixing tests

* unused linting

* gaz

* temp removing these tests as we need placeholder/wrapper APIs for them with the removal of the gateway

* attempting to remove dependencies to gRPC gateway , 1 mroe left in deps.bzl

* renaming flags and other gateway services to http

* goimport

* fixing deepsource

* git mv

* Update validator/package/validator.yaml

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/package/validator.yaml

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update cmd/beacon-chain/flags/base.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update cmd/beacon-chain/flags/base.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update cmd/beacon-chain/flags/base.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* addressing feedback

* missed lint

* renaming import

* reversal based on feedback

* fixing web ui registration

* don't require mux handler

* gaz

* removing gRPC service from validator completely, merged with http service, renames are a work in progress

* updating go.sum

* linting

* trailing white space

* realized there was more cleanup i could do with code reuse

* adding wrapper for routes

* reverting version

* fixing dependencies from merging develop

* gaz

* fixing unit test

* fixing dependencies

* reverting unit test

* fixing conflict

* updating change log

* Update log.go

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* gaz

* Update api/server/httprest/server.go

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* addressing some feedback

* forgot to remove deprecated flag in usage

* gofmt

* fixing test

* fixing deepsource issue

* moving deprecated flag and adding timeout handler

* missed removal of a flag

* fixing test:

* Update CHANGELOG.md

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* addressing feedback

* updating comments based on feedback

* removing unused field for now, we can add it back in if we need to use the option

* removing unused struct

* changing api-timeout flag based on feedback

---------

Co-authored-by: Radosław Kapka <rkapka@wp.pl>
Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

go.mod

@@ -34,7 +34,6 @@ require (
 	github.com/gostaticanalysis/comment v1.4.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.2.2
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.0.1
 	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d
 	github.com/herumi/bls-eth-go-binary v0.0.0-20210917013441-d37c07cfda4e
 	github.com/holiman/uint256 v1.2.4
@@ -281,6 +280,3 @@ require (
 )
 
 replace github.com/json-iterator/go => github.com/prestonvanloon/go v1.1.7-0.20190722034630-4f2e55fcf87b
-
-// See https://github.com/prysmaticlabs/grpc-gateway/issues/2
-replace github.com/grpc-ecosystem/grpc-gateway/v2 => github.com/prysmaticlabs/grpc-gateway/v2 v2.3.1-0.20230315201114-09284ba20446