Add staged contracts as argument for Cadence 1.0 state migration

[jribbink]

Description

unblocks onflow/flow-cli#1426

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For contributor use:

• Targeted PR against master branch
• Linked to GitHub issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the GitHub PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.21%. Comparing base (08ab56f) to head (a96827e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
- Coverage   51.24%   51.21%   -0.04%     
==========================================
  Files          32       32              
  Lines        4205     4202       -3     
==========================================
- Hits         2155     2152       -3     
  Misses       1881     1881              
  Partials      169      169              

Flag	Coverage Δ
unittests	51.21% <ø> (-0.04%)	⬇️

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