fix(torii): close ws properly in blocks/events stream

[Erigara]

Context

Closes #5004.

Problem was that iroha tried to unconditionally closed websocket by writing into it.

During another problems were discovered as well:

• on client side sync and async websocket stream wasn't properly closed (not reads until handshake completion)
• on client async websocket Stream implementation was incorrect by not registering itself on receiving non binary message

Solution

Fix mentioned problems + refactoring.

[DCNick3]

This seems like quite a good improvement over what we had before