Update SignRequest for key manager (#6917)

* Proto: update sign request fields

* Validator client: aggregate signing

* Validator client: proposal signing

* Validator client: attestation signing

* Validator client: update generic sign

* Proto: use ranges

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

Author: terencechain

proto/validator/accounts/v2/BUILD.bazel

@@ -8,6 +8,7 @@ proto_library(
     srcs = ["keymanager.proto"],
     visibility = ["//visibility:public"],
     deps = [
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:proto",
         "@com_google_protobuf//:empty_proto",
         "@go_googleapis//google/api:annotations_proto",
     ],
@@ -20,6 +21,7 @@ go_proto_library(
     proto = ":ethereum_validator_accounts_v2_proto",
     visibility = ["//visibility:public"],
     deps = [
+        "@com_github_prysmaticlabs_ethereumapis//eth/v1alpha1:go_default_library",
         "@go_googleapis//google/api:annotations_go_proto",
     ],
 )