Feat/reshape: Add evaluate_shape to reshape.rs to allow for variable

[orangmuda]

…reshape inputs. Update examples to use isize and variable batch_size.

What does this PR accomplish?

• 🦚 Feature

Changes proposed by this PR:

Notes to reviewer:

📜 Checklist

• [ ] Test coverage is excellent
• [ ] All unit tests pass
• [ ] The juice-examples run just fine
• [ ] Documentation is thorough, extensive and explicit

[drahnr]

Hey @oxctdev :) thanks for opening this PR. The commit seems to be in need of some additional attention, I'll add comments inline.

[drahnr]

Gentle ping?