Automatically choose next open port

[milankl]

Means one can do several browzarr calls after another to e.g. compare datasets across browser windows without manually specifying a new port

[gemini-code-assist]

Code Review

This pull request introduces an autoport feature that automatically increments the port number if the requested port is already tracked in the internal registry. It also updates function signatures to use the Integer type for ports and defines default constants. Feedback indicates that the use of warn() will cause a runtime error and must be replaced with the @warn macro. Additionally, the current port-checking logic only considers the internal registry and should be expanded to check for system-level port availability to ensure robustness.

[gemini-code-assist]

The current implementation only checks if the port is present in the internal SERVERS dictionary. It does not check if the port is already bound by another process on the system. To more robustly find an 'open' port as the PR title suggests, you might want to handle potential 'address in use' errors during the HTTP.serve! call or use a utility to check system-level port availability.

[codecov-commenter]

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[lazarusA]

oh... I just got the notification for this [PRs on GitHub keep not showing sometimes :/ ], and I did a different solution for this in #8

Browzarr.jl/src/servers.jl

Line 4 in c84ae8c

tcp = isnothing(port) ? Sockets.listen(0) : Sockets.listen(parse(IPAddr, host), port)

that finds automatically open ports. I think I will go for that instead.

[milankl]

Yes looks better than the while loop here. Closing in favour of #8