feat(upload): add support on upload to topic

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close #500

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@iyear I add both --topic flag and --to flag.

In this PR, users can use tdl up -c @foo --topic xxx as a legacy but convenient way to upload file to topic.

Or users can use --to and expr, for example, tdl up --to '{ Peer: "@foo", Thread: xxx }' to get the same result.

I wonder if this is a good practice to have two way to get the same goal, or just marking -c as deprecated and only reserving--to is a better solution?

(In my option, it is better if tdl can provide both a convenient way and an advanced way.)

I will update docs after you decide which way is better.

Looking forward to your reply.

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todo: add --to - list all available fields.