perf(*): Send several performance optimizations

[stephenlautier]

One of the main reasons this was done is, because we have quite a heavy load in prod on realtime (~70million in 5days) and sometimes we do get several timeouts as below and we are trying to address this issue

The issue seems the streams are actually timing out, it could be our fault because they are not oneway, since from a stream we emit realtime (which internally is another stream). On a side note we tried to enable the FireAndForget on SMS for the orleans signal provider and streams immediately doesn't work correctly, not sure what the problem is tho

Performance

Send for ConnectionGrain

• Task array pooling
• InvocationMessage change to always immutable

Features

• SendAll reusable (for exclude/send)
• Add shorthand .SendOneWay

BREAKING CHANGES

• Send InvocationMessage (param) is now Immutable<InvocationMessage> - most probably it should be low impact as externally its most likely to use other overload instead Send(this IHubMessageInvoker grain, string methodName, params object[] args)

[claylaut]

@galvesribeiro can you check it out please