Read chain_state genesis from a file

[bkolad]

Description

Read chain_state genesis from a file.

Linked Issues

• Related to module-system: read genesis data from files. #915

Testing

Ci passes.

Docs

no changes.

[codecov]

Codecov Report

Merging #973 (846ca35) into nightly (86d1f00) will increase coverage by 0.0%.
The diff coverage is 100.0%.

❗ Current head 846ca35 differs from pull request most recent head 2b2e5b4. Consider uploading reports for the commit 2b2e5b4 to get more accurate results

Files	Coverage Δ
.../module-implementations/sov-chain-state/src/lib.rs	91.2% <100.0%> (+1.2%)	⬆️
...odule-implementations/sov-chain-state/src/tests.rs	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes