Added withServerTimeout and withKeepAliveInterval to HubConnectionBuilder for java client

[surayya-MS]

Added withServerTimeout and withKeepAliveInterval to HubConnectionBuilder for java client

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Partially fixes #44742

[BrennanConroy]

Why use the object Long instead of the primitive long? It also adds unnecessary Object.nonNull code to HubConnection and we're storing it as long anyways.

[surayya-MS]

The reason for that is the following.
If I used primitive long and withServerTimeout wasn't called in HubConnectionBuilder then default value 0 would be passed to HubConnection constructor and there would be a need to check that serverTimeout is not 0. But what if there would be a case when you want to set serverTimeout to 0. That is why I decided to use Long so that default value would be null and I would check for null in the HubConnection constructor.

[BrennanConroy]

Give the values a default so they won't be 0 if not set.

[surayya-MS]

Done