Deprecate Big Bang extension in favor of zarf dev generate big-bang

[AustinAbro321]

Enhancement Description

• One-line enhancement description (can be used as a release note): Deprecate Big Bang extension in favor of zarf dev generate big-bang
• Zarf Enhancement Proposal: ZEP-2 - Add inital ZEP for Big Bang extension removal #3
• Primary contact (assignee): @AustinAbro321
• Enhancement target (which target equals to which milestone/version):
  • Alpha release target (x.y): v0.42.0
  • Stable release target (x.y): v1.0.0
    Member
• Alpha
  • ZEP (zarf-dev/proposals) update PR(s):
  • Code/Docs (zarf-dev/zarf) update PR(s):