Example project using Huub as a library

[AllenZzw]

Add an example project using Huub as a library for solving jobshop scheduling problem

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
crates/huub-cli/src/cli.rs	82.92% <ø> (ø)
crates/huub-cli/src/main.rs	0.00% <ø> (ø)
crates/huub/src/solver/branchers.rs	90.41% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 21 untouched benchmarks

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_{Comparing AllenZzw:example/jssp (1caaa2a) with develop (32adcb6)}

[CLAassistant]

All committers have signed the CLA.

[Dekker1]

I've refactored this some, and it seems in good shape to me now. The main thing that appears to be missing is a README file to tell people about the example and the format that it accepts (and maybe where to find some instance files). It would also be nice to have one or two created instances that we can keep in the repository and run as part of the test suite.

@AllenZzw Could you see whether you could complete this?