Too many @throws Throwable...

[vudaltsov]

I understand, where this is coming form, but as a library user I have to put @throws Throwable everywhere to suppress Psalm issues.

Also library exceptions are checked. Should we move to unchecked instead, since they are low-level?

[kafkiansky]

Currently, some exceptions come from Amp\ByteStream, while others, thrown by our client, are logical, such as ChannelIsNotTransactional or OperationNotPermitted, or errors related to invalid values, like UriIsInvalid. We can either remove all exceptions above the channel and client methods, as amphp/redis does (https://github.com/amphp/redis/blob/2.x/src/RedisClient.php#L59-L736, https://github.com/amphp/redis/blob/2.x/src/Connection/ReconnectingRedisLink.php#L128), or leave only those that do not inherit from RuntimeException.