feat: implement streams

[o-rumiantsev]

Closes: #42

[o-rumiantsev]

I have added some changes to Connection class:

• Add property streams, which is a Map streamId => stream
• Add property streamPools, which is a Map streamId => { next, chunksPool }, where next is a number which defines an order of next expected chunk to pass to stream, and chunksPool is a Map order => buffer, where order is a number which defines buffer emit order
• Add method stream(readable, callback), which takes readable stream, and redirects it to network
• Add internal method processStream(message), which takes connection message containing stream id
• Add internal method inspectChunksPool(pool, stream, order, buffer), where pool is a pool related to stream, order is a number which defines buffer emit order

[o-rumiantsev]

Changes introduced to watchers:

• Replace reading file with creating read stream
• Emit stream instead of data