Use dynamic ports from CLI

[jlegrone]

What changed?

Updates the temporalite CLI to always use dynamic ports.

Why?

Previously ports for internal APIs were assigned by adding a hardcoded offset to the frontend grpc port. About 10 ports are computed in this way, leading to a high chance of conflicts.

Closes #34.

How did you test it?

Potential risks

Some users may have been depending on the previous behavior, since pprof and metrics ports were predictable (though this was never documented). Explicit flags for setting those ports can be added later.

Is hotfix candidate?

No

[codecov-commenter]

Codecov Report

Merging #48 (3a89a41) into main (4c73c85) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   41.93%   41.87%   -0.06%     
==========================================
  Files          11       11              
  Lines         725      726       +1     
==========================================
  Hits          304      304              
- Misses        399      400       +1     
  Partials       22       22              

Impacted Files	Coverage Δ
cmd/temporalite/main.go	1.36% <0.00%> (-0.01%)	⬇️

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