Add LocalTask for Batch Velox

[chenyangfb]

This PR add support for LocalTask which is used by Batch Velox connector It will be used for communication between NativeEngine operator in Java worker(will be added in a separate PR) and presto_cpp worker. It reuse two of the http endpoint from presto, both are supported in presto_cpp.

1. POST to /v1/task/{taskId} starts execution of the query fragment specified in the POST body. The request includes a set of initial splits to process.
2. GET on /v1/task/{taskId} returns a TaskInfo JSON document containing extended information about the execution status. More details in https://prestodb.io/docs/current/develop/worker-protocol.html

Given LocalTask and RemoteTask are used in different product (Batch Velox vs Presto) and the workload is also different, we decided to keep them separate and we can evolve one of them without breaking the other one. We are also considering using separate http endpoint for Batch Velox vs Presto, but it will be done in future PR.

Test plan - Added unit test TestLocalTask

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[highker]

Before reviewing, please make sure tests pass especially those checkstyle/unittest ones

[miaoever]

LGTM

[tanjialiang]

Thanks for the revision. Overall looks good. I have put some comments on some minor places.

[tanjialiang]

Thanks @chenyangfb! some final comments

[chenyangfb]

Thanks @tangjiangling, updated based on comments.

[highker]

@tanjialiang, could you take another look? The merge needs your approval.

[tanjialiang]

Are we able to merge now?