Implement a retry mechanism for VAST clients failing to connect to the server

[patszt]

1. Added a new actor that allows the caller to connect with a remote node in async/sync manner with a retry mechanism.
2. Adjusted current connect_to_node to use the new actor as a implementation detail.

I have done a simple test to check the retry mechanism.
Run export -> wait a 2 - 3 seconds and run vast start.
Previously the client exits with error:

! system_error: failed to connect to VAST node at 127.0.0.1:42000: !! caf::sec::cannot_connect_to_node: ip_connect failed 127.0.0.1 message("ip_connect failed", "127.0.0.1", 42000)

Now it manages to export the data.

[mavam]

Everything is there, nice. I think we can gut out the code a bit to make it simpler.

[mavam]

@patszt can you please update the user-facing docs as well at the section where it would make sense?

[dominiklohmann]

Some minor requests, and then I think we soon got it. 🚀

[dominiklohmann]

This works really nicely in practice. Just some really minor stuff remaining. Great work, Patryk! 🙏

Request was addressed.