MESH-2071: Update contracts storage

[adamdossa]

changelog

Updates spec_version to 6_000_001

data migration

• Updates PolymeshContracts storage to be under the PolymeshContracts root, rather than `Contracts
• Removes any existing CallRuntimeWhitelist under the old storage root (Contracts)

[codecov]

Codecov Report

Merging #1519 (5ae43ac) into develop (3b5f26a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1519   +/-   ##
========================================
  Coverage    57.51%   57.51%           
========================================
  Files          141      141           
  Lines        30506    30506           
========================================
  Hits         17544    17544           
  Misses       12962    12962           

Files Changed	Coverage Δ
pallets/runtime/develop/src/runtime.rs	3.65% <ø> (ø)

... and 3 files with indirect coverage changes