CSUB-417 Migrating Authorities

[CAGS295]

Description of proposed changes:
Already registered Authorities won’t be migrated. This means that Authorities need to be set again. This is not ideal as it will halt Task scheduling until it is manually done.

The PR includes moving the Storage to the new pallet, a runtime test asserting on the new pallet prefix, and a benchmark for the migration.

Removing the Storage Item from Creditcoin and its GenesisConfig.

Practical tips for PR review & merge:

• All GitHub Actions report PASS
• Newly added code/functions have unit tests
  • Coverage tools report all newly added lines as covered
  • The positive scenario is exercised
  • Negative scenarios are exercised, e.g. assert on all possible errors
  • Assert on events triggered if applicable
  • Assert on changes made to storage if applicable
• Modified behavior/functions - try to make sure above test items are covered
• Integration tests are added if applicable/needed

[github-actions]

For full LLVM coverage report click here!

[codecov-commenter]

Codecov Report

Merging #926 (721345a) into dev (49c2c21) will decrease coverage by 0.46%.
The diff coverage is 12.08%.

@@            Coverage Diff             @@
##              dev     #926      +/-   ##
==========================================
- Coverage   78.15%   77.69%   -0.46%     
==========================================
  Files          68       69       +1     
  Lines       10896    10959      +63     
==========================================
- Hits         8516     8515       -1     
- Misses       2380     2444      +64     

Impacted Files	Coverage Δ
pallets/creditcoin/src/migrations/mod.rs	0.00% <0.00%> (ø)
pallets/creditcoin/src/migrations/v1.rs	93.97% <0.00%> (-0.68%)	⬇️
pallets/creditcoin/src/migrations/v2.rs	91.30% <0.00%> (-1.01%)	⬇️
pallets/creditcoin/src/migrations/v3.rs	95.83% <0.00%> (-0.81%)	⬇️
pallets/creditcoin/src/migrations/v4.rs	79.06% <0.00%> (-3.86%)	⬇️
pallets/creditcoin/src/migrations/v5.rs	90.47% <0.00%> (-1.76%)	⬇️
pallets/creditcoin/src/migrations/v6.rs	87.93% <0.00%> (-0.39%)	⬇️
pallets/creditcoin/src/migrations/v8.rs	0.00% <0.00%> (ø)
pallets/creditcoin/src/mock.rs	100.00% <ø> (ø)
pallets/creditcoin/src/migrations/v7.rs	83.33% <20.00%> (-3.21%)	⬇️
... and 3 more

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[atodorov]

Minor change requested, otherwise looks good to me.

[atodorov]

Added a few more questions.

[nathanwhit]

A couple nits and a comment, but looks good to me

[nathanwhit]

LGTM