Improve VKCell/VInstance

[sebastian-goeldi]

Fixes #283

• Adds convenience from KCell/Instance to VKCell/VInstance
• Add other: KCell|VKCell >> c KCell|VKCell
• All angle bundle router
• On write (KCell/KCLayout) call foreach kcell in kcl.kcells; do kcell.insert_vinsts()

[sourcery-ai]

Hey @sebastian-goeldi - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 2 issues found
• 🟢 Security: all looks good
• 🟡 Testing: 2 issues found
• 🟢 Complexity: all looks good

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