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'

[opti]

• Since bins and ops are mutually exclusive, bin_names could be nil.
• There is no implementation of ==(other) on Aerospike::Operation for @ops.sort to work and I noticed that BatchWrite does not use sort on ops comparison:

  aerospike-client-ruby/lib/aerospike/batch_write.rb

  Lines 43 to 48 in 444508d

  	# Optimized reference equality check to determine batch wire protocol repeat flag.
  	# For internal use only.
  	def ==(other) # :nodoc:
  	other && other.instance_of?(self.class) &&
  	@ops == other.ops && @policy == other.policy && (@policy.nil? || !@policy.send_key)
  	end