[FEATURE] Extract output from previous Tool

[xinyual]

Is your feature request related to a problem?
Now in flow agent and chat agent, tool would be hard to fetch previous tools' output because

1. in flow agent, the key in parameters map would be "<tool_name>.output" and tool_name is defined by customer. So we cannot config this in java code. We need one-more customer defined field like add previous key for PPL tool #131
2. In chat agent, the previous output would be dropped. Only the action_input of this round will be used.

What solution would you like?

1. Extract the field and method inside add previous key for PPL tool #131 into an abstract class implements Tool. Then each tool should extend this abstract Tool
2. A map should be kept inside the runReAct function to store all "<tool_name>: <tool_output>" pairs

[xinyual]

@ylwu-amzn Could you please check this issue to see whether we need to do so? Also, if we build the abstract Tool class, the method to load default prompt like #125 could be also put into it.

[dblock]

@ylwu-amzn ^

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