fix: BatchRead with operations

[opti]

This pull request:

• fixes invalid local variable reference in BatchOperateCommand

  /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:95:in `block in write_buffer': undefined local variable or method `br' for an instance of Aerospike::BatchOperateCommand (NameError)
  
            attr.adjust_read(br.ops)
                             ^^
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:81:in `each'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:81:in `each_with_index'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:81:in `write_buffer'
      from /aerospike-client-ruby/lib/aerospike/command/command.rb:718:in `execute'
      from /aerospike-client-ruby/lib/aerospike/client.rb:973:in `execute_command'
      from /aerospike-client-ruby/lib/aerospike/client.rb:1005:in `block (2 levels) in execute_batch_operate_commands'

• fixes attribute reference in size calculation for the BatchRead

  /aerospike-client-ruby/lib/aerospike/batch_read.rb:91:in `block in size': undefined method `value' for an instance of Aerospike::Operation (NoMethodError)
  
      size += op.value.estimate_size
                ^^^^^^
      from /aerospike-client-ruby/lib/aerospike/batch_read.rb:86:in `each'
      from /aerospike-client-ruby/lib/aerospike/batch_read.rb:86:in `size'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:63:in `block in write_buffer'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:53:in `each'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:53:in `write_buffer'
      from /aerospike-client-ruby/lib/aerospike/command/command.rb:718:in `execute'
      from /aerospike-client-ruby/lib/aerospike/client.rb:973:in `execute_command'
      from /aerospike-client-ruby/lib/aerospike/client.rb:1005:in `block (2 levels) in execute_batch_operate_commands'

• fixes BatchRead with multiple records using operations (2 issues)

  /aerospike-client-ruby/lib/aerospike/batch_read.rb:71:in `==': undefined method `sort' for nil (NoMethodError)
  
      @bin_names.sort == other.bin_names.sort && @ops.sort == other.ops.sort &&
                ^^^^^
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:57:in `block in write_buffer'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:53:in `each'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:53:in `write_buffer'
      from /aerospike-client-ruby/lib/aerospike/command/command.rb:718:in `execute'
      from /aerospike-client-ruby/lib/aerospike/client.rb:973:in `execute_command'
      from /aerospike-client-ruby/lib/aerospike/client.rb:1005:in `block (2 levels) in execute_batch_operate_commands'

  /aerospike-client-ruby/lib/aerospike/batch_read.rb:71:in `sort': comparison of Aerospike::Operation with Aerospike::Operation failed (ArgumentError)
      from /aerospike-client-ruby/lib/aerospike/batch_read.rb:71:in `=='
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:57:in `block in write_buffer'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:53:in `each'
      from /aerospike-client-ruby/lib/aerospike/command/batch_operate_command.rb:53:in `write_buffer'
      from /aerospike-client-ruby/lib/aerospike/command/command.rb:718:in `execute'
      from /aerospike-client-ruby/lib/aerospike/client.rb:973:in `execute_command'
      from /aerospike-client-ruby/lib/aerospike/client.rb:1005:in `block (2 levels) in execute_batch_operate_commands'

[khaf]

Merged and Released.