runtime-sdk: Implement automatic MigrationHandler derivation

[kostko]

TODO

• Tests for the new MigrationHandler derivation.
• Also derive the Module trait.

[codecov]

Codecov Report

Merging #1483 (a66d706) into main (e9991c7) will increase coverage by 0.30%.
The diff coverage is 91.16%.

@@            Coverage Diff             @@
##             main    #1483      +/-   ##
==========================================
+ Coverage   59.20%   59.51%   +0.30%     
==========================================
  Files         135      138       +3     
  Lines        9615     9631      +16     
==========================================
+ Hits         5693     5732      +39     
+ Misses       3880     3857      -23     
  Partials       42       42              

Files Changed	Coverage Δ
runtime-sdk-macros/src/lib.rs	0.00% <0.00%> (ø)
...-sdk/modules/contracts/src/abi/oasis/validation.rs	15.10% <ø> (ø)
runtime-sdk/modules/evm/src/signed_call.rs	92.75% <ø> (ø)
runtime-sdk/modules/evm/src/types.rs	66.66% <ø> (ø)
runtime-sdk/src/dispatcher.rs	18.50% <ø> (ø)
runtime-sdk/src/modules/consensus/mod.rs	85.45% <66.66%> (+7.95%)	⬆️
...-sdk-macros/src/module_derive/migration_handler.rs	86.79% <86.79%> (ø)
runtime-sdk/src/context.rs	67.10% <88.88%> (+<0.01%)	⬆️
...ime-sdk-macros/src/module_derive/method_handler.rs	91.93% <91.93%> (ø)
runtime-sdk-macros/src/module_derive/module.rs	95.45% <95.45%> (ø)
... and 11 more

... and 32 files with indirect coverage changes