resolves #72 introduce a recovery queue

[ggrossetie]

Introduce a recovery queue in order to store data when the connection is lost and send them when the connection is established again.

New options:

• recovery: Enable recovering data when reconnecting after the connection was dropped. Default: false.
• recoveryQueueSizeCalculation: Function used to calculate the size of stored elements. Default: element => element.data.length + element.encoding.length.
• recoveryQueueMaxSize: Positive integer to track the sizes of items added to the cache, and automatically evict items in order to stay below this size. Default: Infinity

This feature is disabled by default.
Should we emit a warning if the user enables this feature without a max size?

Since I've updated the Readme.md in #71, I will add documentation for them once #71 is merged.

Resolves #72

[mcollina]

This also needs some docs

[ggrossetie]

This also needs some docs

Yes.
To avoid conflicts, I'm waiting on #71 to be merged before adding documentation.

[ggrossetie]

Documentation added.

I think we need to decide if we want to emit a warning or emit an event when an error occurred while writing data to the TCP socket. There are two cases where we write data to the TCP socket:

• nominal case
• recovery case when we try to dequeue items from the recovery queue

[mcollina]

lgtm

[mcollina]

Thanks!