Add tx/boxes endpoint and add 'concise' param to tx/history

[arobsn]

This PR adds two changes:

• new /api/v2/tx/boxes endpoint, where given an array of txHashs it returns all contained boxes in transactions
• add concise parameter to /api/v2/tx/history, if this parameter is set to true the endpoint will not include inputs, dataInputs and outputs at the response

[vsubhuman]

@pedromtcosta @ozgrakkurt , please review

[vsubhuman]

@ozgrakkurt , this is similar to the change you been making on the cardano backend, separate endpoint to get inputs and outputs, plus this includes a flag for the history endpoint to not include the same fields that can be received separately

[ozgrakkurt]

This might be confusing since I wouldn't expect a variable to be assigned to undefined explicitly. I would expect null instead since undefined means there is no such variable, but null means the variable isn't filled. Also assigning undefined to something is weird since it is not a real value.

[arobsn]

You are right, sorry about that, fixed!