runtime-sdk: Add rewards module

[kostko]

Fixes #93

TODO

• More tests

[codecov]

Codecov Report

Merging #124 (258bb6a) into main (a8ede39) will increase coverage by 2.77%.
The diff coverage is 84.11%.

❗ Current head 258bb6a differs from pull request most recent head ae1ffa7. Consider uploading reports for the commit ae1ffa7 to get more accurate results

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
+ Coverage   64.67%   67.44%   +2.77%     
==========================================
  Files          48       51       +3     
  Lines        2423     2743     +320     
==========================================
+ Hits         1567     1850     +283     
- Misses        837      874      +37     
  Partials       19       19              

Impacted Files	Coverage Δ
runtime-sdk/src/modules/accounts/mod.rs	74.75% <ø> (ø)
tests/runtimes/simple-keyvalue/src/lib.rs	0.00% <0.00%> (ø)
runtime-sdk/src/context.rs	77.68% <57.14%> (+1.09%)	⬆️
runtime-sdk/src/modules/rewards/mod.rs	71.62% <71.62%> (ø)
runtime-sdk/src/modules/rewards/test.rs	91.48% <91.48%> (ø)
runtime-sdk/src/modules/rewards/types.rs	97.64% <97.64%> (ø)
runtime-sdk/src/testing/mock.rs	96.42% <100.00%> (+0.13%)	⬆️
... and 5 more

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[pro-wh]

rewards