Some rules that check field types do not account for repeated-vs-singular

[apasel422]

Examples:

• api-linter/rules/aip0131/request_name_field.go

  Line 31 in c9e226c

  if f.GetType() != builder.FieldTypeString().GetType() {

• api-linter/rules/aip0132/request_field_types.go

  Line 36 in c9e226c

  if utils.GetTypeName(f) != "string" {

  
  All uses of utils.GetTypeName and desc.FieldDescriptor.GetType should probably be audited.