[Epic] iproto streams follow-ups

[patiencedaur]

Total: 29pt

Related dev. epic: https://github.com/tarantool/roadmap-internal/issues/55

This is mostly technical debt. I believe we have to document all the stream-related features in this batch, not only those developed in Q1.22. The streams page is relatively small, and there is no mention of streams in the net.box API, although it is directly related to iproto. Many other cross-links are missing, too.

Keyword "streams"

• feedback: Streams and interactive transactions | Example error #2503
• [2pt] stream support was added to net.box #2308 document conn:new_stream()
• add interactive transaction support in net.box #2311 document stream begin, commit, and rollback
• [2pt] ability to set timeout for iproto transactions was implemented #2402
• [3pt] Document IPROTO_ID request #2419
• Document required_protocol_version/features net.box options #2418

box.stat

Single document to update

• [2pt] Restructure box.stat page #2862
• [3pt] detailed iproto requests statistics was implemented #2413
• [2pt] getting statistics for iproto streams was implemented #2420
• [2pt] Document box.stat.vinyl().regulator.blocked_writers #2414
• [2pt] getting network statistic per thread was implemented #2421

New Q1 features

• [2pt] Mention streams autocompletion somewhere #2625