Support publishing additional container ports in thv run

[Sanskarzz]

Fix: #3812

Summary

This PR adds support for the --publish / -p flag to the thv run command, enabling users to expose arbitrary container ports to the host, similar to docker run -p. It also fixes a bug in the Docker runtime client where explicitly requested host ports were being overwritten by random ports.

Key Changes

• Added --publish flag to thv run.
• Implemented networking.ParsePortSpec for robust port specification parsing.
• Updated runtime.Setup to handle multiple port bindings efficiently.
• Fixed pkg/container/docker/client.go to respect existing HostPort assignments in generatePortBindings.
• Added unit tests for port parsing logic.

[codecov]

Codecov Report

❌ Patch coverage is 44.44444% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.76%. Comparing base (821b7c6) to head (45115fd).

Files with missing lines	Patch %	Lines
pkg/runtime/setup.go	0.00%	15 Missing ⚠️
pkg/networking/port.go	71.42%	3 Missing and 3 partials ⚠️
pkg/container/docker/client.go	61.53%	2 Missing and 3 partials ⚠️
pkg/runner/config_builder.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3892      +/-   ##
==========================================
- Coverage   66.80%   66.76%   -0.04%     
==========================================
  Files         444      444              
  Lines       44503    44550      +47     
==========================================
+ Hits        29730    29744      +14     
- Misses      12445    12474      +29     
- Partials     2328     2332       +4     

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