feat: add arbitrary feature to sov-db

[vlopes11]

This commit introduces arbitrary derive for the types defined in sov-db.

It also introduces a fallible wrapper for proptest, that expects the types to be infallible. However, the database is created on disk; given the fallible nature of I/O, they must also be subject to fail.

OTOH, a disk write failure is not a logical bug of the SDK, so maybe it would be ok to panic. This could however be inconvenient, as any fuzzing process would be interrupted by such panic.

[codecov]

Codecov Report

Merging #853 (1d30b55) into nightly (e8f32b7) will decrease coverage by 0.2%.
The diff coverage is 100.0%.

❗ Current head 1d30b55 differs from pull request most recent head 5410778. Consider uploading reports for the commit 5410778 to get more accurate results

Files Changed	Coverage Δ
full-node/db/sov-db/src/schema/types.rs	80.7% <ø> (ø)
full-node/db/sov-db/src/ledger_db/mod.rs	91.5% <100.0%> (ø)
full-node/db/sov-db/src/native_db.rs	100.0% <100.0%> (ø)
full-node/db/sov-db/src/state_db.rs	90.6% <100.0%> (ø)

... and 81 files with indirect coverage changes